Adding one more example of while loop

Author: dfava

examples/example_while4.cmd

@@ -0,0 +1,9 @@
+high int a = 0;
+int b = 0;
+while a < 10 {  // High context
+  if (b == 0) { // Still high context
+    b = b + 1;
+  } else {
+    skip;
+  }
+}