Add contributing file

CONTRIBUTING.md

@@ -0,0 +1,45 @@
+
+# How Can I Contribute?
+
+The SimulationCraft team is comprised of volunteer developers from all over the world. We are always looking for new contributors.
+While C++ expertise is certainly helpful, we have several key members with limited coding experience.
+Maintaining optimal talent, gear, and default action priority lists is a huge task and requires virtually zero C++ knowledge.
+
+We are a very laid back group of developers. While certain project members have areas of expertise, 
+there is little in the way of strict responsibility and ownership. Developers are expected to exercise their 
+initiative and help out wherever needed. GitHub provides considerable utilities for oversight. 
+The mantra is: Just check it in. Don't ask for permission. If the code needs to be changed for functional (or artistic!) reasons,
+someone will revert/modify as needed.
+
+## Profiles
+SimulationCraft includes a set of sample profiles for the current raiding tier, which are located in /profiles.
+If you want to improve those profiles, please note to the following:
+ * Change character profile settings like talents & gear in the files you can find at /profiles/generators.
+   The files in /profiles are auto-generated and will be overriden.
+
+## Action Priority List (APL)
+SimulationCraft includes a set of default action priority list for each specialization, to offer users a ready-to-use 
+simulation experience once they import their character. This APL is the main factor defining if a character performs just ok 
+or as good as possible, maximizing their DPS. Naturally, these APL can be constantly improved.
+
+You can directly modify and improve a existing set of action lists and contribute that either directly to your classes main 
+maintainer, through your class Discord or directly as a ticket on Github.
+
+ * As a developer or experienced user, please try to port Action Priority List (APL) changes directly to the class module code,
+   eg. /engine/class_modules/sc_mage.cpp . You can usually find the apl functions near the bottom of the file in functions 
+   called. eg. mage_t::apl_fire()
+
+# Join the Team
+
+If you are interested in joining the team, contact us on Discord or send an email to natehieter@gmail.com with your contact info.
+We look forward to working with you!
+
+Discord: [SimCMinMax](https://discord.gg/tFR2uvK) (#simulationcraft)
+
+# Developers Resources
+Checkout the [Developers Corner wiki page](../../wiki/Participate) for more detailed information on how to setup your 
+SimulationCraft development environment.
+
+Platform specific building instructions can be found on the [How-To-Build wiki](../../wiki/HowToBuild).
+
+Please check out our [CodingGuidelines](../../wiki/CodingGuidelines) before you start.