Create github templates. (firebase#20)

* Create PULL_REQUEST_TEMPLATE.md

* Create ISSUE_TEMPLATE.md

Author: samtstern

Diff for: ISSUE_TEMPLATE.md

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+### [READ] Step 1: Are you in the right place?
+
+  * For issues or feature requests related to __the code in this repository__
+    file a Github issue.
+    * If this is a __feature request__ make sure the issue title starts with "FR:".
+  * For general technical questions, post a question on [StackOverflow](http://stackoverflow.com/)
+    with the firebase tag.
+  * For general Firebase discussion, use the [firebase-talk](https://groups.google.com/forum/#!forum/firebase-talk)
+    google group.
+  * 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/).
+
+### [REQUIRED] Step 2: Describe your environment
+
+  * Operating System version: _____
+  * Firebase SDK version: _____
+  * Library version: _____
+  * Firebase Product: _____ (auth, database, storage, etc)
+
+### [REQUIRED] Step 3: Describe the problem
+
+#### Steps to reproduce:
+
+What happened? How can we make the problem occur?
+This could be a description, log/console output, etc.
+
+#### Relevant Code:
+
+```
+// TODO(you): code here to reproduce the problem
+```

Diff for: PULL_REQUEST_TEMPLATE.md

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+Hey there! So you want to contribute to a Firebase SDK? 
+Before you file this pull request, please read these guidelines:
+
+### Discussion
+
+  * Read the contribution guidelines (CONTRIBUTING.md).
+  * If this has been discussed in an issue, make sure to link to the issue here. 
+    If not, go file an issue about this **before creating a pull request** to discuss.
+
+### Testing
+
+  * Make sure all existing tests in the repository pass after your change.
+  * If you fixed a bug or added a feature, add a new test to cover your code.
+
+### API Changes
+
+  * At this time we cannot accept changes that affect the public API.  If you'd like to help 
+    us make Firebase APIs better, please propose your change in an issue so that we 
+    can discuss it together.