Add contribution guidelines (#178)

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,24 @@
+### I'm submitting a 
+- [ ] bug report.
+- [ ] feature request.
+
+### Current Behaviour:
+<!-- Describe about the bug -->
+
+### Expected Behaviour:
+<!-- Describe what will happen if bug is removed -->
+
+### Steps to reproduce:
+<!-- If you can then please provide the steps to reproduce the bug -->
+
+### Snapshot:
+<!-- If you can then please provide the screenshot of the issue you are facing -->
+
+### Environment:
+<!-- Please provide the following environment details if relevant --> 
+* rustc version
+* cargo version
+* OS details
+
+### Do you want to work on this issue?
+<!-- yes/no -->