Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+This form is for reporting Unity Plugin issues only. To report an issue with the Play Games Service (non-SDK related), check [Google Play Games Services Support](https://developers.google.com/games/services/support).
+*Once you've read this section and determined that your issue is appropriate for this repository, please delete this section.*
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. ___
+2. ___
+3. ___
+4. ___
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Observed behavior**
+A clear and concise description of what you observed.
+
+**Bug Report**
+[Capture](https://developer.android.com/studio/debug/bug-report) a bug report and share the Google Drive link. If the bug report contains sensitive information, then make it private and only give access to requests from `[email protected]` accounts.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Versions**
+- Unity version: ___
+- Google Play Games Plugin for Unity version: ___
+
+**Additional context**
+Add any other context about the problem here.