Add GitHub's issue and pull request templates.

ISSUE_TEMPLATE.md

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+For bug reports, please give the relevant info:
+
+- Gogs version (or commit ref):
+- Git version:
+- Operating system:
+- Database:
+  - [ ] PostgreSQL
+  - [ ] MySQL
+  - [ ] SQLite
+- Log gist:
+
+## Description
+
+...

PULL_REQUEST_TEMPLATE.md

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+Please, make sure you are targeting the `develop` branch!
+
+More instructions about contributing with Gogs code can be found here:
+https://github.com/gogits/gogs/wiki/Contributing-Code