Add CONTRIBUTING document and pull request template

These templates allow for easier pull requests.

CONTRIBUTING.md

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+# Contributing to Maxscale
+
+## Prerequisites
+
+Basically, in order for us to be able to accept a contribution, it must be
+licensed under [BSD-new](http://en.wikipedia.org/wiki/BSD_licenses). Upon
+request, we can also provide a _contributor agreement_ for you to sign.
+
+When you submit a pull request, add the following comment to your pull request.
+
+> I am contributing the new code of the whole pull request, including one or
+  several files that are either new files or modified ones, under the BSD-new
+  license.
+
+Without this comment, the pull request will not be accepted.
+
+## Practicalities
+
+* Please ensure that your pull-request has been made against the correct
+  branch. For bug fixes or minor improvements, use the default branch and for
+  new code, use the `develop` branch (e.g. for a patch to 2.1.x, use the `2.1`
+  branch).
+
+* Please ensure that your code follows our [Coding Style](https://github.com/mariadb-corporation/MaxScale/wiki/Coding-Style-and-Guidelines).
+  All new code should be formatted with the
+  [Astyle configuration](https://github.com/mariadb-corporation/MaxScale/wiki/Coding-Style-and-Guidelines#tldr)
+  provided with the MaxScale source code.

PULL_REQUEST_TEMPLATE.md

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+I am contributing the new code of the whole pull request, including one or
+several files that are either new files or modified ones, under the BSD-new
+license.