Added barebones contributing document

contributing.md

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+We'd love for you to be able to contribute to this project; if you're interested, you'll need the following:
+
+Latest stable version of UPBGE.
+The lastest release of Shuvit (v0.1.2b)
+The latest .blend file (shuvit_v0.1.2b.blend as of time of writing this)
+
+Now that you've got those, follow these steps:
+
+1. Put the .blend fild in the folder with the Shuvit executable
+2. Open UPBGE and choose File -> open
+3. Navigate to the folder where you put the .blend file and select it
+4. Click "open blender file" in UPBGE
+5. Wait for it to import
+6. ????
+7. Profit