docs(README): add contributing section

#1568

README.md

@@ -25,4 +25,21 @@ FineUploader is also simple to use. In the simplest case, you only need to inclu
 There are absolutely no other required external dependencies. For more information, please see the [**documentation**](http://docs.fineuploader.com).
 
 
+## Contributing
+
+Fine Uploader and all other projects in this organization thrive thanks to donations by Widen (the project's sponsor)
+and support by developers in the community. If you'd like to help, the best way to do so is open up a pull request
+that addresses one of the open feature requests or bugs. In order to get started developing Fine Uploader, follow these
+steps to get the project up and running on your local development machine:
+
+1. Download the project repository: `git clone https://github.com/FineUploader/fine-uploader.git`.
+2. Install all project development dependencies: `npm install`.
+3. To run the tests & linter: `$(npm bin)/grunt dev test:firefox` (you'll need Firefox installed locally).
+4. Please follow the [Angular.js commit guidelines][angular-commit].
+5. Please follow the [Git Flow][git-flow] branching strategy.
+
+
 *Fine Uploader is a code library sponsored by [Widen Enterprises, Inc.](http://www.widen.com/)*
+
+[angular-commit]: https://github.com/angular/angular.js/blob/master/CONTRIBUTING.md#commit
+[git-flow]: http://nvie.com/posts/a-successful-git-branching-model/

package.json

@@ -83,5 +83,8 @@
     "start-local-dev": "(. test/dev/handlers/s3keys.sh; php -S 0.0.0.0:9090 -t . -c test/dev/handlers/php.ini)",
     "start-c9-dev": "php -S $IP:$PORT -t . -c test/dev/handlers/php.ini",
     "update-dev": "(cd test/dev/handlers; php composer.phar update)"
+  },
+  "engines" : {
+    "node" : "0.10.33"
   }
 }