docs: add template-sync tool to the documentation

README.md

@@ -38,6 +38,7 @@ with [FrankenPHP](https://frankenphp.dev) and [Caddy](https://caddyserver.com/)
 6. [TLS Certificates](docs/tls.md)
 7. [Using a Makefile](docs/makefile.md)
 8. [Troubleshooting](docs/troubleshooting.md)
+9. [Update](docs/update.md)
 
 ## License
 

docs/update.md

@@ -0,0 +1,10 @@
+# Update your project
+
+You-ve started a project with symfony-docker template and you'd like to benefit from the latest enhancements (i.e. FrankenPHP). Juste use this git based tool
+[template-sync](https://github.com/mano-lis/template-sync) by running :
+```shell
+curl -sSL https://raw.githubusercontent.com/mano-lis/template-sync/main/template-sync.sh | sh -s -- [<url-of-the-template>](https://github.com/dunglas/symfony-docker)https://github.com/dunglas/symfony-docker
+```
+Resolve potential conflicts, run `git cherry-pick --continue` and job is done.
+
+Full documentation [here](https://github.com/mano-lis/template-sync/blob/main/README.md)