Update CONTRIBUTING.md

Make brace position more explicit in both .cpp & .h.

CONTRIBUTING.md

@@ -55,17 +55,22 @@ In short: The easier the code review is, the better the chance your pull request
 
   * ###### Good:
     ```cpp
-    if ()
+    void MyClass::method1()
+    {
+        if (aCondition)
         {
             // Do something
         }
+    }
     ```
 
   * ###### Bad:
     ```cpp
-    if () {
+    void MyClass::method1() {
+        if (aCondition) {
             // Do something
         }
+    }
     ```
   However, the method definition could be defined in a header file (.h), if there's one line code only. In this case, Java-like braces should be used.
   * ###### Good:
@@ -76,7 +81,8 @@ In short: The easier the code review is, the better the chance your pull request
         void method1();
         int method2() {
             return _x; // only one line code can be placed in .h as method definition
-        }
+        };
+
     private:
         int _x;
     }