chore: Add documentation on how to update the plugin (#55)

* chore: Add documentation on how to update the plugin

* add to gitignore ide folders

* style: remove linter

Author: froozeify

.gitignore

@@ -5,3 +5,5 @@ vendor/
 composer.lock
 *.min.*
 var
+/.vscode/
+/.idea/

README.md

@@ -30,3 +30,19 @@ You can also provide a destination path (ie. if your `empty` directory is not in
 * `{LNAME}` will be replaced byt the lowercased name,
 * `{UNAME}` will be replaced by the uppercased name,
 * `{YEAR}` will be replaced by the current year.
+
+## Updating Your Plugin
+
+To import the changes made to the _pluginsGLPI empty_ template into your project,
+we recommend using [_template-sync_](https://github.com/coopTilleuls/template-sync):
+
+1. Run the script to synchronize your project with the latest version of the skeleton:
+
+   ```console
+   curl -sSL https://raw.githubusercontent.com/coopTilleuls/template-sync/main/template-sync.sh | sh -s -- https://github.com/pluginsGLPI/empty
+   ```
+
+2. Resolve conflicts, if any
+3. Run `git cherry-pick --continue`
+
+For more advanced options, refer to [the documentation of _template sync_](https://github.com/coopTilleuls/template-sync#template-sync).