added ch00 #4

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anbansal wants to merge 7 commits into davidflanagan:master from anbansal:master

ch00/test.js

-Original file line number
+Diff line change
@@ -0,0 +1,6 @@
+    let uniqueInteger = (function () { // Define and invoke
+        let counter = 0; // Private state of function below
+        return function() { return counter++; };
+    }());
+    console.log(uniqueInteger()) // => 0
+    console.log(uniqueInteger()) // => 1