Misc: Add CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+Want to contribute? Great!
+
+1. Fork it.
+2. Create a branch (`git checkout -b fixes`)
+3. Commit your changes (`git commit -am "Added Snarkdown"`)
+4. Push to the branch (`git push origin fixes`)
+5. Open a [Pull Request][1]
+
+
+When creating patches read:
+- [TrinityCore Development Standards](http://www.trinitycore.org/f/topic/6-trinitycore-developing-standards/)
+- [WDB Fields](http://www.trinitycore.org/f/topic/58-wdb-fields/)
+- [Git Squash](https://ariejan.net/2011/07/05/git-squash-your-latests-commits-into-one/)
+
+We suggest you to create one branch for each `C++` based fix: on that way you can continue creating more fixes without having to wait to get one pull request merged.  
+For the `SQL` files of `C++` based fixes the naming schema is: `YYYY_MM_DD_i_database_description.sql`, where `YYYY_MM_DD` is the date of the fix, `i_database` is the *ith* sql created that day for `database`. 
+When doing changes to `auth` or `characters` database remember to update the base files (`/sql/base/*`).  
+For SQL only fixes [create a ticket](https://github.com/TrinityCore/TrinityCore/issues/new).
+
+Wiki
+====
+
+The wiki is located at [http://trinitycore.info](http://trinitycore.info).
+
+You are welcome to create an account and help us improve and extend the wiki.
+
+
+Issues
+======
+
+Read [this](http://www.trinitycore.org/f/topic/37-the-trinitycore-issuetracker-and-you/) before creating a ticket.  
+If you have problems with TrinityCore instalation, read http://www.trinitycore.org/f/topic/1518-trouble-with-your-trinity-install-readme-1st-faqs/
+
+
+Requirements
+============
+
+Platform: Linux, Windows or Mac  
+Processor with SSE2 support  
+Boost ≥ 1.4.9  
+MySQL ≥ 5.1.0
+CMake ≥ 2.8.11.2 / 2.8.9 (Windows / Linux) 
+OpenSSL ≥ 1.0.0  
+GCC ≥ 4.7.2 (Linux only)  
+MS Visual Studio ≥ 12 (2013) (Windows only)
+
+In case you choose Linux, we recommend to use Debian 7, it's the Linux we use to test compilations.  
+Remember 4.3.4 branch is alpha, only intended for development, we don't recomend this branch to run a server.