Add Github issue template

issue_template.md

@@ -0,0 +1,17 @@
+# Checklist
+- [ ] I followed the [troubleshooting guide](https://github.com/astahlman/ob-async#troubleshooting) and it did not address my issue
+- [ ] I've included a link to a Github Gist with the full contents of my `troubleshooting.org` buffer
+- [ ] Each section below is filled in and includes sufficient detail to reproduce the issue
+
+# Expected Behavior
+
+
+# Actual Behavior
+
+
+# Steps to Reproduce
+
+
+# Troubleshooting Artifacts
+
+(_Copy-paste the contents of your `troubleshooting.org` buffer into a [gist](https://gist.github.com/) and add the link here_)