Update contribution guide

Author: flovilmart

CONTRIBUTING.md

@@ -1,10 +1,49 @@
-### Contributing to Parse Server
+# Contributing to Parse Server
 
-#### Pull Requests Welcome!
+We really want Parse to be yours, to see it grow and thrive in the open source community.
 
-We really want Parse to be yours, to see it grow and thrive in the open source community.  
+If you are not familiar with Pull Requests and want to know more about them, you can visit the [Creating a pull request](https://help.github.com/articles/creating-a-pull-request/) article. It contains detailed informations about the process.
 
-##### Please Do's
+## Setting up the project for debugging and contributing:
+
+### Recommended setup:
+
+* [vscode](https://code.visualstudio.com), the popular IDE.
+* [Jasmine Test Explorer](https://marketplace.visualstudio.com/items?itemName=hbenl.vscode-test-explorer), a very practical test exploration plugin which let you run, debug and see the test results inline.
+
+### Setting up you local machine:
+
+* [Fork](https://github.com/parse-community/parse-server) this project and clone the fork on your local machine:
+
+```sh
+$ git clone https://github.com/parse-community/parse-server
+$ cd parse-server # go into the clone directory
+$ npm install # install all the node dependencies
+$ code . # launch vscode
+$ npm run watch # run babel watching for local file changes
+```
+
+Once you have babel running in watch mode, you can start making changes to parse-server.
+
+### Good to know:
+
+* The lib/ folder is not commited, so never make changes in there.
+* Always make changes to files in the `src/` folder.
+* All the tests should point to sources in the `lib/` folder.
+
+### Troubleshooting:
+
+*Question*: I modify the code in the src folder but it doesn't seem to have any effect.<br/>
+*Answer*: Check that `npm run watch` is running
+
+*Question*: How do I use breakpoints and debug step by step?<br/>
+*Answer*: The easiest way is to install [Jasmine Test Explorer](https://marketplace.visualstudio.com/items?itemName=hbenl.vscode-test-explorer), it will let you run selectively tests and debug them.
+
+*Question*: How do I deploy my forked version on my servers?<br/>
+*Answer*: In your `package.json`, update the `parse-server` dependency to `https://github.com/MY_USERNAME/parse-server#MY_FEATURE`. Run `npm install`, commit the changes and deploy to your servers.
+
+
+### Please Do's
 
 * Begin by reading the [Development Guide](http://docs.parseplatform.org/parse-server/guide/#development-guide) to learn how to get started running the parse-server.
 * Take testing seriously! Aim to increase the test coverage with every pull request. To obtain the test coverage of the project, run:
@@ -17,7 +56,7 @@ We really want Parse to be yours, to see it grow and thrive in the open source c
 * Lint your code by running `npm run lint` to make sure the code is not going to be rejected by the CI.
 * **Do not** publish the *lib* folder.
 
-##### Run your tests against Postgres (optional)
+### Run your tests against Postgres (optional)
 
 If your pull request introduces a change that may affect the storage or retrieval of objects, you may want to make sure it plays nice with Postgres.
 
@@ -28,6 +67,6 @@ If your pull request introduces a change that may affect the storage or retrieva
   - `it_only_db('mongo')` // will make a test that only runs on mongo
   - `it_exclude_dbs(['postgres'])` // will make a test that runs against all DB's but postgres
 
-##### Code of Conduct
+### Code of Conduct
 
 This project adheres to the [Contributor Covenant Code of Conduct](https://github.com/parse-community/parse-server/blob/master/CODE_OF_CONDUCT.md). By participating, you are expected to honor this code.