Create ISSUE_TEMPLATE.md

Author: samtstern

ISSUE_TEMPLATE.md

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+### Step 1: Are you in the right place?
+
+  * For issues or feature requests related to the code **in this repository** file a Github issue.
+  * For general technical questions, post a question on [StackOverflow](http://stackoverflow.com/) tagged appropriately.
+  * For general Firebase discussion, use the [firebase-talk google group](https://groups.google.com/forum/#!forum/firebase-talk)
+  * For help troubleshooting your application that does not fall under one of the above categories, reach out to the [personalized Firebase support channel](https://firebase.google.com/support/contact/troubleshooting/)
+
+### Step 2: Describe your environment
+
+  * Android device: _____
+  * Android OS version: _____
+  * Google Play Services version: _____
+  * Firebase/Play Services SDK version: _____
+  * FirebaseUI version: ____
+  
+### Step 3: Describe the problem:
+
+#### Steps to reproduce:
+
+  1. _____
+  2. _____
+  3. _____
+  
+#### Observed Results:
+
+  * What happened?  This could be a description, `logcat` output, etc.
+  
+#### Expected Results:
+
+  * What did you expect to happen?
+  
+#### Relevant Code:
+
+  ```
+  // TODO(you): code here to reproduce the problem
+  ```