Rename GitHub templates to md. They are Markdown.

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,33 @@
+**This issue tracker is a tool to address bugs in Flask itself.
+Please use the #pocoo IRC channel on freenode or Stack Overflow for general
+questions about using Flask or issues not related to Flask.**
+
+If you'd like to report a bug in Flask, fill out the template below. Provide
+any any extra information that may be useful / related to your problem.
+Ideally, create an [MCVE](http://stackoverflow.com/help/mcve), which helps us
+understand the problem and helps check that it is not caused by something in
+your code.
+
+---
+
+### Expected Behavior
+
+Tell us what should happen.
+
+```python
+Paste a minimal example that causes the problem.
+```
+
+### Actual Behavior
+
+Tell us what happens instead.
+
+```pytb
+Paste the full traceback if there was an exception.
+```
+
+### Environment
+
+* Python version:
+* Flask version:
+* Werkzeug version: