Merge readme into one file

Author: clementAC

README.md

@@ -2,4 +2,29 @@
 
 This repository holds the documentation for the [crowdsec project](https://github.com/crowdsecurity/crowdsec).
 
-Online version of this documentation is available here: https://doc.crowdsec.net/
+Online version of this documentation is available here: https://doc.crowdsec.net/
+
+The documentation is built using [Docusaurus 2](https://docusaurus.io/), a modern static website generator.
+
+## Installation
+
+```console
+npm install
+```
+
+## Local Development
+
+```console
+npm run start
+```
+
+This command starts a local development server and opens up a browser window. Most changes are reflected live without having to restart the server.
+
+## Build
+
+```console
+npm run build
+```
+
+This command generates static content into the `build` directory and can be served using any static contents hosting service.
+you can also use the `npm run serve` command to test the build locally.