Create initial contributors guidelines

CONTRIBUTING.md

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+# Contributing to Apollo
+
+First off, thanks for taking the time to contribute!   
+Apollo is a high-performance, modular RuneScape emulator with a collection of utilities for managing data files and plugins.  
+The following is a set of guidelines for contributing to Apollo on GitHub.
+
+* [Forking](#forking)
+* [Submission Guidelines](#submit)
+    *  [Submitting an Issue](#submit-issue)  
+    *  [Submitting a Pull Request](#submit-pull-request)    
+* [Coding Style](#coding-style)  
+* [Got a Question or Problem](#got-a-question-or-problem)
+
+## Forking 
+You should fork the repository first. This step is needed only once. See complete help in github
+`git clone https://github.com/apollo-rsps/apollo.git`  
+`cd apollo`  
+`git remote add upstream https://github.com/apollo-rsps/apollo.git`  
+`git fetch upstream`  
+
+Keep your fork up to date, pull in upstream changes:  
+`git fetch upstream`  
+`git merge upstream/master`  
+
+## Submission Guidelines
+### Submitting an Issue
+
+Before you submit your issue search the archive, maybe your question was already answered.
+Related Issues - has a similar issue been reported before?
+Suggest a Fix - if you can't fix the bug yourself, perhaps you can point to what might be causing the problem (line of code or commit)
+
+### Submitting a Pull Request
+Run all the tests to assure nothing else was accidentally broken. 
+
+- Create a new branch: `git branch <branch-name>`  
+- Switch to the new branch: `git checkout <branch-name>`   
+- Add your change: `git add <file-name>`   
+- Comment your change: `git commit -m "my-PR-comment"`  
+- Push your branch to GitHub: `git push -u origin <branch-name>`    
+
+If you need to rebase your branch, The git book has a very good guide on doing this (and some more information about rebasing), which you can find [here](https://git-scm.com/book/en/v2/Git-Branching-Rebasing).
+## Coding Style
+
+Please follow the [Java styleguides](http://www.oracle.com/technetwork/java/codeconvtoc-136057.html) or [Ruby styleGuides](http://api.rubyonrails.org).
+
+## Got a Question or Problem?
+
+Most discussion related to the development of Apollo happens on the IRC channel #apollorsps on irc.freenode.net.  
+Please contact us if you need help!