Added PR template and task version bumping steps (#184)

.github/pull_request_template.md

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+**Task name**: <Name of changed or new pipeline task>
+
+**Description**: <Describe your changes here>
+
+**Documentation changes required:** (Y/N) <Please mark if documentation changes are required>
+
+**Added unit tests:** (Y/N) <Please mark if unit tests were added or updated according changes>
+
+**Attached related issue:** (Y/N) <Please add link to related issue here>
+
+**Checklist**:
+- [ ] Task version was bumped - please check [instruction](https://github.com/microsoft/google-play-vsts-extension/tree/master/docs/taskversionbumping.md) how to do it
+- [ ] Checked that applied changes work as expected

docs/taskversionbumping.md

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+# Bumping task version
+To bump task version - please change 'version' field in task.json and task.loc.json files following the steps below:
+1. Check current Azure DevOps sprint - https://whatsprintis.it/
+2. If sprint number differs from current minor number - set it to current sprint number, set patch to 0
+3. If the minor version and the sprint number are the same - increase patch number
+
+For major changes (large behavioral changes or changes without backward support) increase major number.