Updated CONTRIBUTORS and added a CONTRIBUTING file.

CONTRIBUTING.md

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+Contributing to SharpNav
+========================
+
+In general, contributors should follow the style of the code around their
+contributions and keep code well-documented.
+
+Contributors are expected to follow these guidelines when contributing to
+SharpNav:
+
+  - Your code should follow the [C# Coding Conventions][1] and [Framework
+    Design Guidelines][2] as closely as possible except where noted here.
+  - Code should be indented with hard tabs with a tabstop of 4.
+  - Line length is not strictly enforced and is not currently consistent
+    in SharpNav. Use your best judgement and wrap long statements where it
+    makes the most sense. In most cases, lines wrap around 120 columns.
+  - All public and internal members should be documented with [XML
+    Documentation Comments][3].
+  - If adding new functionality, write associated unit tests.
+  - Ensure that your changes compile on all configurations. When using 2d or
+    3d vectors, add this block just after your `using` statements to get your
+    changes working with the engine/framework-integrated versions of SharpNav:
+
+```csharp
+#if MONOGAME
+using Vector3 = Microsoft.Xna.Framework.Vector3;
+#elif OPENTK
+using Vector3 = OpenTK.Vector3;
+#elif SHARPDX
+using Vector3 = SharpDX.Vector3;
+#endif
+```
+
+  - Exceptions to the Framework Design Guideline are acceptable as long as
+    they are considered 'normal' patterns for high-performance or video game
+    related purposes. For example, the use of large structs with static
+    methods and `ref`/`out` parameters. This pattern is commonly used for
+    vectors and matrices in just about every C# graphics/game framework.
+  - By submitting a pull request, you are licensing your changes under the
+    terms of the MIT license. A copy of the MIT license is available in the
+    `LICENSE` file in this directory and on the [OSI website][4].
+
+If you are unsure about anything (besides licensing), go ahead and submit the
+pull request and a maintainer will let you know if there's anything you should
+change to meet these requirements.
+
+
+[1]: http://msdn.microsoft.com/en-us/library/ff926074.aspx
+[2]: http://msdn.microsoft.com/en-us/library/ms229042.aspx
+[3]: http://msdn.microsoft.com/en-us/library/b2s063f7.aspx
+[4]: http://opensource.org/licenses/MIT

CONTRIBUTORS.md

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+SharpNav Contributors
+=====================
+
+(Sorted chronologically)
+
+  - **[Robert Rouhani](https://github.com/Robmaister)** <robert.rouhani@gmail.com>
+    - Original author
+    - Maintainer
+
+  - **[Samuel Yuan](https://github.com/samuelyuan)** <yuans@rpi.edu>
+    - Ported majority of Recast to C#
+
+  - **[Renjie Xie](https://github.com/xrj800)** <xier@rpi.edu>
+    - Ported parts of Recast to C#
+	- Added several missing test cases.
+
+See the [full list of contributors](https://github.com/Robmaister/SharpNav/graphs/contributors)