Added contribution info

CONTRIBUTING.md

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+# How to contribute
+
+TotalFreedomMod aims to be a fully functional all-op server mod which works in
+a large range of configurations. In order to be as flexible as possible on the
+server-end, we encourage contributing to TotalFreedomMod by making 'pull-requests'
+to this repository.
+
+## Getting Started
+
+* Make sure you have a [GitHub account](https://github.com/signup/free)
+* If the issue is a bug, submit a ticket for it, assuming one does not already exist.
+  * Clearly describe the issue including steps to reproduce it.
+  * Make sure you fill in the earliest version that you know has the issue.
+* Fork the repository on GitHub
+
+## Making Changes
+
+* Create a topic branch from where you want to base your work.
+  * This is usually the master branch.
+  * Only target release branches if you are certain your addition must be on that
+    branch.
+  * To quickly create a topic branch based on master; `git checkout -b contribution`
+    Please avoid working directly on the `master` branch.
+* Make changes and commit where necessary.
+* Check for unnecessary whitespace with `git diff --check` before committing.
+* Make sure your commit messages are in line with those which are already made.
+* Make sure your changes build (*and work!*).
+
+## Tips on getting your pull request accepted
+* Make sure your changes work and compile without difficulty
+* Make sure your change adds something useful, do not add commands to micromanage
+  the server. (ie: Shorthands for a collection of commands)
+* Features must be in line the general idea of "Total Freedom".
+* Changes must be directed towards the main "TotalFreedom" server. Adding names such
+  as the name of your own TotalFreedom-like server will get your pull request denied.
+* Do not add yourself to the developer list.
+* Ensure that you use the correct whitespace-style. That is: 4 spaces as indentation.
+* Please make sure your changes are written such as other features would be. Eg: commands
+  have their own class and extend TFM_Command.
+* Make sure your code is written in the [Allman style](http://en.wikipedia.org/wiki/Indent_style#Allman_style).
+* Do not increment the version number.
+* If you want to add multiple changes, please make one pull request per change. This
+  way, it's easier to accept your changes faster and won't block the other changes if there
+  is an issue with a specific line of code.
+* Please make sure there are no bugs in your code.
+* Please avoid having to add files in the main namespace where possible.
+* Make sure all changes work before you commit these, this avoids having multiple
+  unnecessary commits.
+
+## Submitting Changes
+
+* Push your changes to a topic branch in your fork of the repository.
+* Submit a pull request to this repository.
+  * Explain in detail what each one of your commits changes and point out any big changes.
+* Wait as a developer evaluates your changes.
+
+# Additional Resources
+
+* [TotalFreedom information](http://totalfreedom.me)
+* [TotalFreedom forums](http://totalfreedom.boards.net)
+* [Bug tracker](https://github.com/TotalFreedom/TotalFreedomMod/issues)
+* [General GitHub documentation](http://help.github.com/)
+* [GitHub pull request documentation](http://help.github.com/send-pull-requests/)