Adds github tempaltes, refs #112 (#155)

.github/ISSUE_TEMPLATE/bug.md

@@ -0,0 +1,35 @@
+---
+name: Bug
+about: Create a report of something is not working
+labels: 'bug'
+---
+
+# Bug report
+
+<!--
+Hi, thanks for submitting a bug. We appreciate that.
+
+But, we will need some information about what's wrong to help you.
+-->
+
+## What's wrong
+
+<!--
+Describe what is not working.
+
+Please, attach a traceback.
+We would also appreciate a failing test case.
+That is EXTREMELY helpful!
+-->
+
+## How is that should be
+
+<!-- Describe how it should work. -->
+
+## System information
+
+- OS:
+- `python` version:
+- `django` version:
+- `mypy` version:
+- `django-stubs` version: