Add client documentation

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diff --git a/.github/CONTRIBUTING.md b/.github/CONTRIBUTING.md
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@@ -28,6 +28,8 @@ Do not hesitate to talk about the functionnality you want to develop by creating
 
 The client is a web application developed with [TypeScript](https://www.typescriptlang.org/)/[Angular2](https://angular.io/)
 
+Newcommer? You can find a documentation of the server code/architecture [here](https://github.com/Chocobozzz/PeerTube/blob/master/support/doc/client/code.md).
+
 
 ## Write documentation
 
diff --git a/support/doc/client/code.md b/support/doc/client/code.md
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+# Client code documentation
+
+The client is a HTML/CSS/JavaScript web application (single page application -> SPA) developed with [TypeScript](https://www.typescriptlang.org/)/[Angular 2](https://angular.io/).
+
+
+## Technologies
+
+  * [TypeScript](https://www.typescriptlang.org/) -> Language
+  * [Angular 2](https://angular.io) -> JavaScript framework
+  * [SASS](http://sass-lang.com/) -> CSS framework
+  * [Webpack 2](https://webpack.github.io/docs/) -> Source builder (compile TypeScript, SASS files, bundle them...)
+  * [Bootstrap](http://getbootstrap.com/) -> CSS framework
+  * [WebTorrent](https://webtorrent.io/) -> JavaScript library to make P2P in the browser
+  * [VideoJS](http://videojs.com/) -> JavaScript player framework
+
+
+## Files
+
+The client files are in the `client` directory. The Webpack 2 configurations files are in `client/config` and the source files in `client/src`.
+The client modules description are in the [client/package.json](https://github.com/Chocobozzz/PeerTube/blob/master/client/package.json). There are many modules that are used to compile the web application in development or production mode.
+Here is the description of the useful `client` files directory:
+
+    tslint.json   -> TypeScript linter rules
+    tsconfig.json -> TypeScript configuration for the compilation
+    .bootstraprc  -> Bootstrap configuration file (which module we need)
+    config        -> Webpack configuration files
+    src
+    |__ app          -> TypeScript files for Angular 2 application
+    |__ assets       -> static files (images...)
+    |__ sass         -> SASS files that are global for the application
+    |__ standalone   -> files outside the Angular application (embed HTML page...)
+    |__ index.html   -> root HTML file for our Angular 2 application
+    |__ main.ts      -> Main TypeScript file that boostraps our Angular 2 application
+    |__ polyfills.ts -> Polyfills imports (ES 2015...)
+    |__ vendor.ts    -> Vendor imports (Angular, Bootstrap...)
+
+Details of the Angular 2 application file structure. It tries to follow [the official Angular 2 styleguide](https://angular.io/docs/ts/latest/guide/style-guide.html).
+
+    app
+    |__ account                      -> Account components (password change...)
+    |__ admin                        -> Admin components (friends, users...)
+    |__ core                         -> Core components/services
+    |__ login                        -> Login component
+    |__ shared                       -> Shared components/services (search component, REST services...)
+    |__ videos                       -> Video components (list, watch, upload...)
+    |__ app.component.{html,scss,ts} -> Main application component
+    |__ app.module.ts                -> Angular 2 root module that imports all submodules we need
+
+## Conventions
+
+Uses [TSLint](https://palantir.github.io/tslint/) for TypeScript linting and [Angular 2 styleguide](https://angular.io/docs/ts/latest/guide/style-guide.html).
+
+## Developing
+
+  * Install [the dependencies](https://github.com/Chocobozzz/PeerTube#dependencies)
+  * Run `npm install` at the root directory to install all the dependencies
+  * Run MongoDB
+  * Run `npm run dev` to compile the client and automatically run the server. Then the server will watch and compile the client files automatically. You just need to refresh the browser to see your modifications.
+
+In a Angular 2 application, we create components that we put together. Each component is defined by an HTML structure, a TypeScript file and optionnaly a SASS file.
+If you are not familiar with Angular 2 I recommend you to read the [quickstart guide](https://angular.io/docs/ts/latest/quickstart.html).
+
+## Components tree
+
+![Components tree](https://github.com/Chocobozzz/PeerTube/blob/master/support/doc/client/components-tree.png)
+
+## Newcomers
+
+The main client component is `app.component.ts`. You can begin to look at this file. Then you could navigate in the different submodules to see how components are built.
diff --git a/support/doc/client/components-tree.png b/support/doc/client/components-tree.png
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