Add PR and ISSUE template

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,14 @@
+<!--
+
+Thanks for filing an issue! If this is a question or feature request, just delete
+everything here and write out the request, providing as much context as you can.
+
+-->
+
+### What version of `arc` are you using ?
+
+### What issue did you run into?
+
+### What did you expect to see?
+
+### What did you see instead?

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+Work-in-progress PRs are welcome as a way to get early feedback - just prefix
+the title with [WIP].
+
+Add the change in the changelog (except for test changes and docs updates).
+Please edit CHANGELOG.md and add the change under the appropriate category (NEW
+FEATURES, IMPROVEMENTS & BUG FIXES) along with the PR number.
+-->
+
+### What does this do / why do we need it?
+
+### What should your reviewer look out for in this PR?
+
+### Do you need help or clarification on anything?
+
+### Which issue(s) does this PR fix?
+
+<!--
+
+fixes #
+fixes #
+
+-->