added README

README.md

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+# angular-contenteditable
+
+An AngularJS directive to bind html tags with the `contenteditable` attribute to models.
+
+## Usage
+
+```html
+<div contenteditable ng-model="model"></div>
+```
+
+## Development
+
+```bash
+npm install
+grunt build
+grunt karma:e2e
+```