added to example program

examples/hello_world.dn

@@ -1,7 +1,20 @@
-def Main : {
-    printf["hello world"];
-    printf["wtf2"];
-    printf["wtf1"];
+// another function
+def AnotherFunction : {
+    printf["Hello from another function!"];
 };
 
+
+// every program needs a main :)
+def Main : {
+    // define variables
+    a = 10;
+    b = 20;
+
+    // print statements
+    printf["a + b: "];
+    printf[{ int } a + b];
+     
+    // calling functions
+    call AnotherFunction;
+};
 call Main;