* Create a repeatify folder under string_manipulations (hacktoberfest17#1132)

* Create a JS function to repeat a string called repeatify.js

Author: sherlyc

string_manipulations/repeatify/repeatify.js

@@ -0,0 +1,11 @@
+//Write down a function which after triggering like this:
+//console.log('hello'.repeatify(3))
+//Should print hellohellohello.
+
+String.prototype.repeatify =
+  String.prototype.repeatify ||
+  function(count) {
+    return this.repeat(count);
+  };
+
+console.log("hello".repeatify(3)); //hellohellohello