added code style conventions

Author: Christian Bender

CodingGuidelines.md

@@ -0,0 +1,19 @@
+# Code style convention  
+
+Please orient on this guide before you sent a pull request.  
+
+---
+
+## User-interface  
+
+Please write a simple user interface for your programs. Not a blinking cursor!  
+What does the program do?  
+What want the program an user informations?  
+
+---
+
+## Code style conventions  
+
+See [here](https://users.ece.cmu.edu/~eno/coding/CCodingStandard.html)  
+Don't push all code in one line!  
+