add a simple README file

README.md

@@ -0,0 +1,18 @@
+Gridster.js
+===========
+
+Gridster is a jQuery plugin that makes building intuitive draggable
+layouts from elements spanning multiple columns. You can even
+dynamically add and remove elements from the grid.
+
+More at [http://gridster.net/](http://gridster.net/).
+
+License
+=======
+
+Distributed under the MIT license.
+
+Whodunit
+========
+
+Gridster is built by [Ducksboard](http://ducksboard.com/).