Updated README

Author: laemtl

modules/electrophysiology_browser/images/electrodes-2d-hover.png

@@ -1,21 +1,55 @@
+# EEG Browser Visualization
+
 ## Main dependencies
 
-### Ramda (https://ramdajs.com)
+- [Ramda](https://ramdajs.com)
 A practical functional library for JavaScript programmers.
 
-### Redux (https://redux.js.org)
+- [Redux](https://redux.js.org):
 A Predictable State Container for JS Apps
 
-### Visx (https://airbnb.io/visx)
+- [Visx](https://airbnb.io/visx):
 A collection of expressive, low-level visualization primitives for React.
 
-### RxJS (https://rxjs-dev.firebaseapp.com/guide/overview)
+- [RxJS](https://rxjs-dev.firebaseapp.com/guide/overview):
 RxJS is a library for composing asynchronous and event-based programs by using observable sequences. 
 It provides one core type, the Observable, satellite types (Observer, Schedulers, Subjects) and operators to allow handling asynchronous events as collections.
 
-### TypeScript (https://www.typescriptlang.org)
+- [TypeScript](https://www.typescriptlang.org)
 A static type checker for javascript.
 
-### Protocol Buffers (https://developers.google.com/protocol-buffers)
+- [Protocol Buffers](https://developers.google.com/protocol-buffers)
 To install the Protocol Buffers Compiler (protoc), run:
 `apt install -y protobuf-compiler`
+
+
+## User manual
+
+The EEG Browser visualization component adds support for some useful visual helpers: The **Signal Viewer** and the **Electrode Map**.
+
+![Overall View](./../../images/overall-view.png)
+
+### Signal Viewer
+![Signal Viewer](./../../images/signal-values-details.png) <br/><br/>
+Several tools can be used to navigate through the Signal Viewer:
+ - The **Timeline Range View** (1) can be used to change the boundaries of the viewed timeline.
+ - The **Amplitude** and **Filter** tools (2) can be used to increase/reduce the amplitude scale and apply high or low-pass filters.
+ - The **Channel navigation** (3) can be used to navigate through the viewed channels.
+ - The **Event Panel** (4) can be used to display information about the events when event data is available.
+ - If the selected timeline range contains more than 100 events, a message (5) indicates the user to reduce the boundaries of the timeline in order to display the event data.
+<br/><br/>
+<p align="center">
+  <img width="650" src="./../../images/signal-values.png"/><br/>
+  <sub>Signal Viewer with signal values and event data displayed.</sub>
+</p>
+
+### Electrode Map 
+The current implementation of the Electrode Map supports 2 display modes: 2D and 3D.
+
+| 2D View | 3D View |
+|:-------------------------:|:-------------------------:|
+|<img width="300" src="./../../images/electrodes-2d-hover.png"/><br/> The 2D view is a stereographic projection of the electrodes position. Electrodes are indexed and their name is displayed on mouse hover.  | <img width="300" src="./../../images/electrodes-3d.png" /><br/> The 3D view displays the exact position of the electrodes on the brain. |
+
+### Future developements to come
+
+A signal annotation feature is currently under development.