Added issue template

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,21 @@
+<!-- Thank you for using Zefyr! -->
+
+## Steps to Reproduce
+
+<!-- Please tell us exactly how to reproduce the problem you are running into. -->
+
+1. ...
+2. ...
+3. ...
+
+## Logs
+
+<!-- Include any relevant logs or exception traces if applicable. -->
+
+```
+```
+
+<!-- Paste the output of running `flutter doctor -v` here. -->
+
+```
+```