Create CONTRIBUTING.md

Author: AzatothTheAwakened

CONTRIBUTING.md

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+# Contributing Guidelines
+
+## Creating a good Pull request
+Try to make your code clean and readable. 
+If not you can still create a Pull request. 
+We will try to give you advice on how to improve your solution.
+ 
+## Structuring your solution
+Please try to follow those rough guidelines:
+
+For each day create a class.
+
+- Example: The solution for day 5 should be called `Day5`
+
+Each part should have its own Method and should be called in a main method.
+This improves the readability and its easier to understand how you solved the different parts.
+
+ - Rough example for day 5:
+
+```java
+public class Day5 {
+    public static void main(String[] args) {
+        System.out.println("Solution for part one: " + partOne());
+        System.out.println("Solution for part two: " + partTwo());
+    }
+    
+    public static int partOne() {
+        // implements solution for part one
+    }
+    
+    public static int partTwo() {
+        // implements solution for part two
+    }
+    
+    // Additional Methods needed for solutions above
+}
+```