Update issue templates

Adding bug report, documentation, and general inquiry templates. 

There's no easy way to redirect "general inquiry" directly to forum. If better option is available later, will update.

.github/ISSUE_TEMPLATE/documentation-issue.md

@@ -0,0 +1,21 @@
+---
+name: Documentation issue
+about: Create a report to help us improve our documentation.
+title: "[DOC]"
+labels: documentation
+assignees: ''
+
+---
+
+**Describe the issue**
+Please describe the issue and expected clarification in concise language.
+
+**Reference**
+Please attach the URL at which you are experiencing the issue. 
+
+**Screenshot**
+If applicable, please attach screenshot.
+
+**Browser**
+- Browser: [e.g. Chrome]
+- Version: [e.g. 80.0.3987.132]