ISSUES.md (#8158)

* ISSUES.md

* Update ISSUES.md

ISSUES.md

+**If you open a GitHub issue, here is our policy.**
+
+1. It must be a bug, a feature request, or a significant problem with documentation (for small docs fixes please send a PR instead). 
+
+2. The form below must be filled out.
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+3. The issue should be related to the repo it is created in. 
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+Please go to [Stack Overflow](https://stackoverflow.com/questions/tagged/tensorflow-model-garden) for help and support.
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+Please understand that research models (https://github.com/tensorflow/models/tree/master/research) included in this repository are experimental and research-style code. They are not officially supported.
+
+**Here's why we have that policy**
+
+TensorFlow developers respond to issues. We want to focus on work that benefits the whole community, e.g., fixing bugs and adding features. 
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+We want to focus on the work that benefits the whole community, e.g., fixing bugs and adding features. 
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+Individual support should be sought on Stack Overflow or other non-GitHub channels. 
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+It helps us to address bugs and feature requests in a timely manner.