Create issue_template.md

Author: Kevin Scott

issue_template.md

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+Issue tracker is **ONLY** used for reporting bugs. If you are running into issues with Tensorflow.js or Machine Learning in general, please use [stackoverflow](https://stackoverflow.com).
+
+<!--- Provide a general summary of the issue in the Title above -->
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Codepen or Repo**
+Please provide a link to a hosted code snippet (on Codepen or similar site) _or_ a Github repository.