Add issue and pull request template

.github/ISSUE_TEMPLATE.md

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+Please take a moment to search that an issue doesn't already exist.
+
+For bug reports, please give the relevant info:
+
+- Gogs version (or commit ref):
+- Git version:
+- Operating system:
+- Database:
+  - [ ] PostgreSQL
+  - [ ] MySQL
+  - [ ] SQLite
+- Log gist:
+
+## Description
+
+...