docs: Add README.md files for various messaging platforms

- Added README.md files for Chanify, DingTalk, Discord, Gitter, GoogleChat, IGot, Lark, Mattermost, MicrosoftTeams, NowPush, Ntfy, Push, Pushback, Pushover, Pushplus, QQ, RocketChat, ServerChan, ShowdocPush, Slack, Telegram, WeWork, XiZhi, YiFengChuanHua, Zulip
- Each README.md file contains a link to the respective platform's documentation

src/Chanify/README.md

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+# Chanify | [Home](./../../)
+
+## [Usage example](./../../tests/Chanify/ClientTest.php)
+
+## Related links
+
+* [https://github.com/chanify/chanify-ios](https://github.com/chanify/chanify-ios)

src/DingTalk/README.md

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+# DingTalk | [Home](./../../)
+
+## [Usage example](./../../tests/DingTalk/ClientTest.php)
+
+## Related links
+
+* [https://developers.dingtalk.com/document/app/custom-robot-access](https://developers.dingtalk.com/document/app/custom-robot-access)

src/Discord/README.md

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+# Discord | [Home](./../../)
+
+## [Usage example](./../../tests/Discord/ClientTest.php)
+
+## Related links
+
+* [https://discord.com/developers/docs/resources/webhook#edit-webhook-message](https://discord.com/developers/docs/resources/webhook#edit-webhook-message)

src/Gitter/README.md

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+# Gitter | [Home](./../../)
+
+## [Usage example](./../../tests/Gitter/ClientTest.php)
+
+## Related links
+
+* [https://developer.gitter.im/docs/messages-resource](https://developer.gitter.im/docs/messages-resource)

src/GoogleChat/README.md

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+# GoogleChat | [Home](./../../)
+
+## [Usage example](./../../tests/GoogleChat/ClientTest.php)
+
+## Related links
+
+* [https://developers.google.com/hangouts/chat/how-tos/webhooks](https://developers.google.com/hangouts/chat/how-tos/webhooks)

src/IGot/README.md

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+# IGot | [Home](./../../)
+
+## [Usage example](./../../tests/IGot/ClientTest.php)
+
+## Related links
+
+* [http://hellyw.com/#/](http://hellyw.com/#/)

src/Lark/README.md

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+# Lark | [Home](./../../)
+
+## [Usage example](./../../tests/Lark/ClientTest.php)
+
+## Related links
+
+* [https://www.feishu.cn/hc/zh-CN/articles/360024984973](https://www.feishu.cn/hc/zh-CN/articles/360024984973)

src/Mattermost/README.md

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+# Mattermost | [Home](./../../)
+
+## [Usage example](./../../tests/Mattermost/ClientTest.php)
+
+## Related links
+
+* [https://api.mattermost.com/l](https://api.mattermost.com/)

src/MicrosoftTeams/README.md

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+# MicrosoftTeams | [Home](./../../)
+
+## [Usage example](./../../tests/MicrosoftTeams/ClientTest.php)
+
+## Related links
+
+* [https://www.microsoft.com/zh-cn/microsoft-teams/teams-for-work](https://www.microsoft.com/zh-cn/microsoft-teams/teams-for-work)

src/NowPush/README.md

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+# NowPush | [Home](./../../)
+
+## [Usage example](./../../tests/NowPush/ClientTest.php)
+
+## Related links
+
+* [https://nowpush.io/api-docs/](https://nowpush.io/api-docs/)

src/Ntfy/README.md

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+# Ntfy | [Home](./../../)
+
+## [Usage example](./../../tests/Ntfy/ClientTest.php)
+
+## Related links
+
+* [https://ntfy.sh/](https://ntfy.sh/)

src/Push/README.md

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+# Push | [Home](./../../)
+
+## [Usage example](./../../tests/Push/ClientTest.php)
+
+## Related links
+
+* [https://docs.push.techulus.com/api-documentation](https://docs.push.techulus.com/api-documentation)

src/Pushback/README.md

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+# Pushback | [Home](./../../)
+
+## [Usage example](./../../tests/Pushback/ClientTest.php)
+
+## Related links
+
+* [https://pushback.io/docs/getting-started](https://pushback.io/docs/getting-started)

src/Pushover/README.md

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+# Pushover | [Home](./../../)
+
+## [Usage example](./../../tests/Pushover/ClientTest.php)
+
+## Related links
+
+* [https://pushover.net/](https://pushover.net/)

src/Pushplus/README.md

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+# Pushplus | [Home](./../../)
+
+## [Usage example](./../../tests/Pushplus/ClientTest.php)
+
+## Related links
+
+* [https://pushplus.hxtrip.com/index](https://pushplus.hxtrip.com/index)

src/QQ/README.md

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+# QQ | [Home](./../../)
+
+## [Usage example](./../../tests/QQ/ClientTest.php)
+
+## Related links
+
+* [https://bot.q.qq.com/wiki/develop/api/openapi/message/post_messages.html](https://bot.q.qq.com/wiki/develop/api/openapi/message/post_messages.html)

src/RocketChat/README.md

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+# RocketChat | [Home](./../../)
+
+## [Usage example](./../../tests/RocketChat/ClientTest.php)
+
+## Related links
+
+* [https://docs.rocket.chat/guides/administration/admin-panel/integrations](https://docs.rocket.chat/guides/administration/admin-panel/integrations)

src/ServerChan/README.md

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+# ServerChan | [Home](./../../)
+
+## [Usage example](./../../tests/ServerChan/ClientTest.php)
+
+## Related links
+
+* [https://sct.ftqq.com/](https://sct.ftqq.com/)

src/ShowdocPush/README.md

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+# ShowdocPush | [Home](./../../)
+
+## [Usage example](./../../tests/ShowdocPush/ClientTest.php)
+
+## Related links
+
+* [https://push.showdoc.com.cn/#/](https://push.showdoc.com.cn/#/)

src/Slack/README.md

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+# Slack | [Home](./../../)
+
+## [Usage example](./../../tests/Slack/ClientTest.php)
+
+## Related links
+
+* [https://api.slack.com/messaging/webhooks](https://api.slack.com/messaging/webhooks)

src/Telegram/README.md

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+# Telegram | [Home](./../../)
+
+## [Usage example](./../../tests/Telegram/ClientTest.php)
+
+## Related links
+
+* [https://core.telegram.org/bots/api#sendmessage](https://core.telegram.org/bots/api#sendmessage)

src/WeWork/README.md

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+# WeWork | [Home](./../../)
+
+## [Usage example](./../../tests/WeWork/ClientTest.php)
+
+## Related links
+
+* [https://open.work.weixin.qq.com/api/doc/90000/90136/91770](https://open.work.weixin.qq.com/api/doc/90000/90136/91770)

src/XiZhi/README.md

@@ -1,18 +1,7 @@
-# XiZhi
+# XiZhi | [Home](./../../)
 
-## Usage
+## [Usage example](./../../tests/XiZhi/ClientTest.php)
 
-```php
-$authenticator = new Guanguans\Notify\XiZhi\Authenticator('XZd60aea56567ae39a1b1920cbc42bb5bd');
-$client = new Guanguans\Notify\XiZhi\Client($authenticator);
+## Related links
 
-$response = $client->send(Guanguans\Notify\XiZhi\Messages\SingleMessage::make([
-    'title' => 'This is title.',
-    'content' => 'This is content.',
-]));
-
-$response = $client->send(Guanguans\Notify\XiZhi\Messages\ChannelMessage::make([
-    'title' => 'This is title.',
-    'content' => 'This is content.',
-]));
-```
+* [https://xz.qqoq.net/#/index](https://xz.qqoq.net/#/index)

src/YiFengChuanHua/README.md

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+# YiFengChuanHua | [Home](./../../)
+
+## [Usage example](./../../tests/YiFengChuanHua/ClientTest.php)
+
+## Related links
+
+* [https://www.phprm.com/push/h5/](https://www.phprm.com/push/h5/)

src/Zulip/README.md

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+# Zulip | [Home](./../../)
+
+## [Usage example](./../../tests/Zulip/ClientTest.php)
+
+## Related links
+
+* [https://zulip.com/api/send-message](https://zulip.com/api/send-message)