[doc] README.md avec présentation, prérequis, tuto d'utilisation (WiP) et de contribution

README.md

@@ -2,7 +2,64 @@
 
 # DUP Tools
 
-Tools for DUP Protocol.
+A tools box lib for DUP (Dividend Universal Protocol) in WebAssembly (WASM).
+
+- Rust **reliability**
+- WebAssembly **performances**
+- Javascript **wide usability**
+
+You can use DUP tools directly in [modern browsers](https://caniuse.com/#feat=wasm) or server side with [node.js](https://nodejs.org/).
+
+#### Project state
+
+[![npm version](https://img.shields.io/npm/v/dup-tools-wasm.svg)](https://www.npmjs.com/package/dup-tools-wasm)
+[![pipeline status](https://git.duniter.org/tools/dup-tools-wasm/badges/master/pipeline.svg)](https://git.duniter.org/tools/dup-tools-wasm/commits/master)
+[![coverage report](https://git.duniter.org/tools/dup-tools-wasm/badges/master/coverage.svg)](https://git.duniter.org/tools/dup-tools-wasm/commits/master)
+
+## 📝 Usage
+
+[Full usage exemple with online demo](https://git.duniter.org/tools/dup-tools-front#readme)
+
+### ⚡  Quick start guide
+
+1. install [npm](https://www.npmjs.com/get-npm)
+2. Create an empty folder for your project, and open a terminal in it.
+3. To install `dup-tools-wasm` run
+```bash
+npm install dup-tools-wasm
+```
+
+4. create a js file `myFirstExperiment.js` with the following code :
+
+```javascript
+import * as dup from "dup-tools-wasm";
+
+const keypair = dup.generate_ed25519_keypair("salt", "password");
+console.log(keypair);
+```
+
+>>> WiP
+
+5. ![Fork](http://forked.yannick.io/images/favicon.png) for in browser use case :
+
+create an html file `index.html` with the following code :
+
+```html
+<meta charset="utf-8"/>
+<h1>See your console result (F12 by default)</h1>
+<script module src="myFirstExperiment.js"></script>
+```
+
+5. ![Fork](http://forked.yannick.io/images/favicon.png) for node.js use case :
+
+>>> End WiP
+
+
+## Contribute
+
+### 🔮 Prerequisites
+
+You need [wasm-pack](https://github.com/rustwasm/wasm-pack#--wasm-pack) and it prerequisites ([Rust and npm](https://rustwasm.github.io/wasm-pack/book/prerequisites/index.html))
 
 ### 🛠️ Build with `wasm-pack build`