Adds PR & Issue templates.

Contributing refers to example-specific content.

.github/CONTRIBUTING.md

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+## Contribute
+
+1. Check for open issues, or open a new issue to start a discussion around a
+   new example or a bug.
+2. If you feel uncomfortable or uncertain about an issue or your changes, feel free to contact us on Gitter using the link above.
+3. Fork [the repository](https://github.com/deeplearning4j/dl4j-examples.git) on GitHub to start making your changes to the **master** branch (or branch off of it).
+4. If you're providing a new example, please help reference it by adding notes
+   of relevant publications to the code comments, including links if
+   available. If you fix an existing example, write a test, which shows that the bug was fixed or that the feature works as expected.
+5. Note the repository follows
+   the [Google Java style](https://google.github.io/styleguide/javaguide.html)
+   with two modifications: 120-char column wrap and 4-spaces indentation. You
+   can format your code to this format by typing `mvn formatter:format` in the
+   subproject you work on, by using the `contrib/formatter.xml` at the root of
+   the repository to configure the Eclipse formatter, or by [using the INtellij
+   plugin](https://github.com/HPI-Information-Systems/Metanome/wiki/Installing-the-google-styleguide-settings-in-intellij-and-eclipse).
+
+6. Send a pull request, and bug us on Gitter until it gets merged and published.

.github/ISSUE_TEMPLATE.md

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+#### Issue Description
+
+Please describe your issue, along with:
+- expected behavior
+- encountered behavior
+
+#### Version Information
+
+Please indicate relevant versions, including, if relevant:
+
+* Deeplearning4j version
+* platform information (OS, etc)
+* CUDA version, if used
+* NVIDIA driver version, if in use
+
+#### Contributing
+
+If you'd like to help us fix the issue by contributing some code, but would
+like guidance or help in doing so, please mention it!

.github/PULL_REQUEST_TEMPLATE.md

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+## What changes were proposed in this pull request?
+
+(Please fill in changes proposed in this fix)
+
+## How was this patch tested?
+
+(Please explain how this patch was tested. E.g. unit tests, integration tests, manual tests)
+
+Please review
+https://github.com/deeplearning4j/deeplearning4j/blob/master/CONTRIBUTING.md before opening a pull request.