Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing to cemu_UI
+The following is a set of guidelines for contributing to cemu_UI.
+
+## Java Sytleguide
+If your willing to contribute to cemu_UI please us the following example as guide and rules to design your code.
+* Use names for methods and variables that clarify their purpose. (This will help a lot to understand the code)
+* Use as many spaces as necessary to make the code clear, but as little as possible.
+* Sort all variables according to their type.
+* For all (debugging) console outputs, use the log4j based logger. (syso/syse is okay for testing)
+
+ ```java
+  // Use this as a sample Class:
+  public ClassName () {
+    
+    void MethodName () {
+       double gameID; // Title-ID used on the Wii U
+       
+       if (gameID == null) {
+          // Do something
+       }
+       
+       // more code ...
+    }
+    
+  }
+
+  ```