add issue template

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,38 @@
+<!-- Please provide the following information. -->
+
+### Versions
+```
+<!--
+angular-playground version
+-->
+```
+
+```
+<!--
+Output from: `ng --version`.
+-->
+```
+
+### Repro steps
+<!--
+Simple steps to reproduce this bug.
+Please include: commands run, packages added, related code changes.
+A link to a sample repo would help too.
+-->
+* Step 1
+* Step 2
+* Step 3
+
+### Observed Behavior
+```
+<!-- Normally this includes a stack trace and some more information -->
+```
+
+### Desired Behavior
+```
+<!-- 
+What do you expect to see?
+-->
+```
+
+### Any other details that may be useful (optional)