update README with installation instruction

README.md

@@ -6,8 +6,28 @@
 A simple Python brute-force login cracker. Basically, a simplified Python version of Hydra [https://github.com/vanhauser-thc/thc-hydra].
 
 
+## Installation
+
+1. Download latest package release from [packages registry](https://gitlab.cylab.be/cylab/dokos/-/packages)
+2. Install with :
+
+```bash
+python3 -m pip install ./dokos-*-py3-none-any.whl
+```
+
 ## Usage
 
+You can now use with 
+
+```bash
+dokos -l <login> -P <passwords list> -f <failed login message> <url>
+```
+
+The **failed login message** is required so dokos can recognize when a login attempt has failed, and hence to detect
+when login is sucessfull.
+
+For example:
+
 ```bash
-./dokos.py -l <login> -P <passwords list> <url>
+dokos -l jane.doe@example.com -P 10-million-password-list.txt -f "Bad combination of e-mail and password" https://example.com/login
 ```