Add Contributing file for github PR

CONTRIBUTING.md

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+Contributions are welcome.
+
+The public git repository can be found on [http://github.com/wraith/wraith github].
+
+## Guides
+ * [http://github.com/guides/fork-a-project-and-submit-your-modifications Github's contribution guide]
+ * [http://github.com/guides/pull-requests Github's pull request guide]
+ * [http://raw.github.com/git/git/master/Documentation/SubmittingPatches Git's Submitting Patches Guide]
+
+There's two options for submitting patches:
+ * Use github's pull requests to submit patches.
+ * Send patches to wraith-patches@botpack.net.
+  * [http://www.kernel.org/pub/software/scm/git/docs/git-format-patch.html git-format-patch(1)] should be used for all patches.
+
+## Guidelines
+ * Please stick to the coding style found in the files.
+  * No tabs
+  * 2 spaces indented for each level
+  * Braces on the same line as `if', `else', functions, etc.
+ * Avoid non-portable code
+ * No ASM
+ * Comment all changes which are not clear
+ * No change should introduce warnings into the normal or debug compiling.
+ * Use strlcpy,strlcat,snprintf,strdup
+ * Do not allocate large buffers on the stack (char x[4096] = "")
+ * Avoid excessive use of strlen(), cache your values when possible.
+ * Use very little C++ additions. (Adds too much overhead since most of the code is using c stdlib)
+  * Avoid all STL.
+  * Do not use exceptions
+  * No RTTI
+ * Communicate with other developers in #wraith on EFnet.