Update github related pages

.github/CONTRIBUTING(zh_CN).md

@@ -1,3 +1,5 @@
 [English](CONTRIBUTING.md) | 中文
 
-请参阅 [开发者代码贡献指南](https://github.com/linuxdeepin/developer-center/wiki/Contribution-Guidelines-for-Developers) Wiki 页面。
+在您尝试贡献之前，建议参阅 [Open Source Guides 的“如何贡献”页面](https://opensource.guide/zh-cn/how-to-contribute/) 以了解通用的贡献方式和常见问题。
+
+关于参与 Deepin 贡献的步骤和须知，请参阅 [开发者代码贡献指南](https://github.com/linuxdeepin/developer-center/wiki/Contribution-Guidelines-for-Developers) Wiki 页面。

.github/CONTRIBUTING.md

@@ -1,3 +1,5 @@
 English | [中文](CONTRIBUTING(zh_CN).md)
 
-Please refer to [Contribution Guidelines for Developers](https://github.com/linuxdeepin/developer-center/wiki/Contribution-Guidelines-for-Developers-en) from the wiki page.
+Before your contribution, it's recommended to check out [Open Source Guides‘s "How to Contribute" page](https://opensource.guide/how-to-contribute/) to learn more about the generic issues and suggestions about how to contribute. 
+
+For Deepin specific contribution guideline, please refer to [Contribution Guidelines for Developers](https://github.com/linuxdeepin/developer-center/wiki/Contribution-Guidelines-for-Developers-en) from the wiki page.

.github/ISSUE_TEMPLATE/bug_report(zh_CN).md

@@ -4,6 +4,7 @@ about: 报告程序错误以帮助我们改进
 
 ---
 <!--请将下方的缺陷汇报模板中的文字替换为您实际需要汇报的缺陷所对应的描述文字。-->
+<!--请保持一个 Issue 只专注一个缺陷，如果您有多个不同的缺陷需要汇报，请发起多个 Issue 。-->
 
 ## 缺陷描述
 <!--简明清晰的描述你所需要汇报的缺陷（BUG）-->

.github/ISSUE_TEMPLATE/bug_report.md

@@ -3,6 +3,7 @@ name: Bug report
 about: Create a report to help us improve
 
 ---
+<!--Please keep one issue focus on one bug, If you have multiple issues to report, try open multiple issues to report each of them.-->
 
 ## Describe the bug
 <!--A clear and concise description of what the bug is.-->