Update issue templates

Add some baseline issue templates to help users report bugs or request features.

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,25 @@
+---
+name: Bug report
+about: Create a report to help us improve
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps used to reproduce the behavior:
+1. Launch gamemod with '...'
+2. Run game '....'
+3. View output of '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**System Info (please complete the following information):**
+ - OS and version: [e.g. Ubuntu 18.04]
+ - GameMode Version [e.g. 1.1 or git sha]
+
+**Additional context**
+Add any other context about the problem here.