Added functionallity to handle functions

cc_code_preview/Preview/classes.ccl

@@ -6,7 +6,7 @@ public lib Preview.Classes {
             this._name = name;
         }
 
-        public getName(): string {
+        public func getName(): string {
             return this._name;
         }
     }

cc_code_preview/Preview/functions.ccl

@@ -2,4 +2,8 @@ public lib Preview.Functions {
     public func isTrue(value: bool): bool {
         return value;
     }
+
+    public func add(value1: number, value2: number): number {
+        return value1 + value2;
+    }
 }