more usage

README.md

@@ -8,6 +8,8 @@ Currently:
 
 ## Install & configure
 
+### Install
+
 Download the most recent binaries at https://gitea.champs-libres.be/julienfastre/cl-cli/releases
 
 Once downloaded, install it:
@@ -20,7 +22,7 @@ sudo install cl-cli /usr/local/bin/cl-cli
 sudo install cl-cli /usr/local/bin/cl
 ```
 
-## Configure
+### Configure
 
 Copy the file [config.toml.dist](./config.toml.dist) as a template, and
 save it at the path `$HOME/.config/cl-cli/config.toml`:
@@ -32,3 +34,22 @@ editor $HOME/.config/cl-cli/config.toml
 ```
 
 Then, fill it with the required configuration options (gitlab and openproject token).
+
+
+## Usage
+
+### Convert a gitlab issue into a work package
+
+
+```bash
+cl-cli planning i2work https://gitlab.com/Chill-Projet/chill-bundles/-/issues/240 chill
+```
+
+Where:
+
+- `https://gitlab.com/Chill-Projet/chill-bundles/-/issues/240` is the URL of the issue
+- `chill` is the identifier of the project in openproject (see the identifier 
+  in the URL like the page "Vue globale": https://champs-libres.openproject.com/projects/chill/, or 
+  see it there: https://champs-libres.openproject.com/projects/chill/identifier (Paramètres du projet / changer 
+  l'identifiant (bouton en haut)))
+