Add CONTRIBUTING and ISSUE_TEMPLATE (#534)

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,25 @@
+# Help us help you
+  - [ ] I have checked that my issue [doesn't exist yet](https://github.com/alliedmodders/amxmodx/issues).
+  - [ ] I have tried my absolute best to reduce the problem-space and have provided the absolute smallest test-case possible.
+  - [ ] I can always reproduce the issue with the provided description below.
+
+# Environment
+  * Operating System version: 
+  * Game/AppID (with version if applicable): 
+  * Current AMX Mod X version: 
+  * Current Metamod version:
+  - [ ] I have updated AMX Mod X to the [latest version](https://www.amxmodx.org/downloads.php) and it still happens.
+  - [ ] I have updated AMX Mod X to the [latest snapshot](https://www.amxmodx.org/snapshots.php) and it still happens.
+  - [ ] I have updated Metamod to the [latest version](https://www.amxmodx.org/downloads.php) and it still happens.
+
+# Description
+
+
+# Problematic Code (or Steps to Reproduce)
+  ```PAWN
+  // TODO(you): code here to reproduce the problem
+  ```
+
+# Logs
+* Please attach in separate files: game output, library logs, kernel logs, and any other supporting information.
+* In case of a crash, please attach minidump or dump analyze output.