Update issue templates

Author: ShubhamJagtap2000

.github/ISSUE_TEMPLATE/custom.md

@@ -0,0 +1,15 @@
+---
+name: Custom issue template
+about: Describe any issue with this repo
+title: ''
+labels: documentation, enhancement, good first issue, invalid
+assignees: ShubhamJagtap2000
+
+---
+
+## What to add to this issue template??
+
+- Any queries regarding the repo content
+- Any additions in the documentation
+- Any feature/notes suggestion
+- Any other queries