readme added

README.md

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 # class2context
 javascript library, to add context menu functionallity to html page
+
+Demo: class2context_DEMO.html
+
+
+### Usage
+First, include the files
+```html
+<link rel='StyleSheet' type='text/css' href='class2context.css'>
+<script src='class2context.js'></script>
+```
+
+Then, for each class, call the function
+```js
+class2context('className', "title for contextmenu", [["option 1", "function1()"], ["option 2","function2()"]]);
+```
+
+