Added CLA and CONTRIBUTING.md files

CONTRIBUTING.md

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+# How to Contribute #
+
+We're always looking for people to help make NzbDrone even better, there are a number of ways to contribute. To get started, <a href="http://www.clahub.com/agreements/NzbDrone/NzbDrone">sign the Contributor License Agreement</a>.
+
+## Documentation ##
+Setup guides, FAQ, the more information we have on the wiki the better.
+
+## Development ##
+
+### Tools required ###
+- Visual Studio 2012
+- HTML/Javascript editor of choice (Sublime Text/Webstorm/etc)
+- npm (node package manager)
+- git
+
+### Getting started ###
+
+1.  Fork NzbDrone 
+2.  Clone (develop branch)
+3.  Run `npm install`
+4.  Run `grunt` - Used to compile the UI components and copy them (leave this window open)
+5.  Compile in Visual Studio
+
+### Contributing Code ###
+- If you're adding a new, already requested feature, please move it to In Progress on [Trello](http://trello.nzbdrone.com "Trello") so work is not duplicated.
+- Rebase from NzbDrone's develop branch, don't merge
+- Make meaningful commits, or squash them
+- Feel free to make a pull request before work is complete, this will let us see where its at and make comments/suggest improvements
+- Reach out to us on the forums or on IRC if you have any questions
+- Add tests (unit/integration)
+- Commit with *nix line endings for consistency (We checkout Windows and commit *nix)
+- Try to stick to one feature per request to keep things clean and easy to understand
+- Use 4 spaces instead of tabs, this is the default for VS 2012 and WebStorm (to my knowledge)
+
+### Pull Requesting ###
+- You're probably going to get some comments or questions from us, they will be to ensure consistency and maintainability
+- We'll try to respond to pull requests as soon as possible, if its been a day or two, please reach out to us, we may have missed it
+
+If you have any questions about any of this, please let us know.