add documentation for getInput()

src/input.c

@@ -15,6 +15,9 @@ char getch(void);
     } 
 }*/
 
+/** getInput gets the userinput and reacts to input of w,a,s,d, arrow keys, p or q 
+  * utilises getch() and kbhit, no parameters, no returns
+  */
 void getInput(){
   if(kbhit()){  
     char key= getch();