Reword docs (#176)

* Reword documentation;

* Wrap lines at 80 characters in the documentation.

* Wrap CONTRIBUTING.md too;

* Tweaks to CONTRIBUTING.md wording;

* Move development section to CONTRIBUTING.md;

* Explain database creation in CONTRIBUTING.md;

1 files changed, 67 insertions, 7 deletions

diff --git a/.github/CONTRIBUTING.md b/.github/CONTRIBUTING.md
index 3764eb7c4..989087728 100644
--- a/.github/CONTRIBUTING.md
+++ b/.github/CONTRIBUTING.md
@@ -7,30 +7,90 @@ Interesting in contributing? Awesome :)
   * [Give your feedback](#give-your-feedback)
   * [Develop on the Server side](#develop-on-the-server-side)
   * [Develop on the Client side](#develop-on-the-client-side)
+  * [Get started with development](#get-started-with-development)
   * [Write documentation](#write-documentation)
 
 
 ## Give your feedback
 
-Even if you are not a developer, or you do not want to develop on PeerTube you can give a feedback on potential bugs, features that you are interested in, user interace, design, decentralized architecture...
+You don't need to know how to code to start contributing to PeerTube! Other
+contributions are very valuable too, among which: you can test the software and
+report bugs, you can give feedback on potential bugs, features that you are
+interested in, user interace, design, decentralized architecture...
 
 
+## Development
+
 ## Develop on the Server side
 
-The server is a web server developed with [NodeJS](https://nodejs.org)/[Express](http://expressjs.com).
+The server is a web server developed with
+[NodeJS](https://nodejs.org)/[Express](http://expressjs.com).
 
-Newcommer? You can find a documentation of the server code/architecture [here](https://github.com/Chocobozzz/PeerTube/blob/master/support/doc/server/code.md).
+Newcomer? You can find a documentation of the server code/architecture
+[here](https://github.com/Chocobozzz/PeerTube/blob/master/support/doc/server/code.md).
 
-Do not hesitate to talk about the functionnality you want to develop by creating an issue :)
+Don't hesitate to talk about features you want to develop by creating an issue
+before you start working on them :).
 
 
 ## Develop on the Client side
 
-The client is a web application developed with [TypeScript](https://www.typescriptlang.org/)/[Angular2](https://angular.io/)
+The client is a web application developed with
+[TypeScript](https://www.typescriptlang.org/)/[Angular2](https://angular.io/).
+
+Newcomer? You can find a documentation of the server code/architecture
+[here](https://github.com/Chocobozzz/PeerTube/blob/master/support/doc/client/code.md).
+
+
+## Get started with development
+
+In this mode, the server will run requests between instances more quickly, the
+video durations are limited to a few seconds.
+
+### Prerequisites
+
+First, make sure that you have followed the steps to install the dependencies.
+
+Then, create a postgres database and user with the values set in the
+`config/default.yaml` file. For instance, if you do not change the values
+there, the following commands would create a new database called `peertube_dev`
+and a postgres user called `peertube` with password `peertube`:
+
+```bash
+    # sudo -u postgres createuser -P peertube
+    Enter password for new role: peertube
+    # sudo -u postgres createdb -O peertube peertube_dev
+```
+
+### Server side
+
+To develop on the server-side:
+
+```bash
+    $ npm run dev:server
+```
+
+Then, the server will listen on `localhost:9000`. When server source files
+change, these are automatically recompiled and the server will automatically
+restart.
+
+### Client side
+
+To develop on the client side:
+
+```bash
+    $ npm run dev:client
+```
+
+The API will listen on `localhost:9000` and the frontend on `localhost:3000`.
+Client files are automatically compiled on change, and the web browser will
+reload them automatically thanks to hot module replacement.
 
-Newcommer? You can find a documentation of the server code/architecture [here](https://github.com/Chocobozzz/PeerTube/blob/master/support/doc/client/code.md).
+**Username**: *root* <br/>
+**Password**: *test*
 
 
 ## Write documentation
 
-You can help to write the documentation of the REST API, code, architecture, demonstrations...
+You can help to write the documentation of the REST API, code, architecture,
+demonstrations...