Create ISSUE_TEMPLATE.md

Author: Anthropic

.github/ISSUE_TEMPLATE.md

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+<!-- 
+Only include sections relevant to your issue.
+
+If you have not read docs/support.md and followed its guidance you may be ignored or closed without response.
+
+Please use PREVIEW before you submit!!
+-->
+#### Enhancement
+As a user/developer, when I ... I should be able to ...
+
+#### Expected behaviour
+I expected ...
+
+#### Actual behaviour
+It actually ...
+
+#### Gist/Plunker/Demo
+[Description](url)
+
+#### Related issues
+This is/maybe related to ...
+
+@json-schema-form/angular-schema-form-lead