Add handle files section to the doc

doc/book/src/getting_started/files.md

@@ -1 +1,42 @@
 # Handle files
+
+We recommend the use of MinIO Client to interact with Garage files (`mc`).
+Instructions to install it and use it are provided on the [MinIO website](https://docs.min.io/docs/minio-client-quickstart-guide.html).
+Before reading the following, you need a working `mc` command on your path.
+
+## Configure `mc`
+
+You need your access key and secret key created in the [previous section](bucket.md).
+You also need to set the endpoint: it must match the IP address of one of the node of the cluster and the API port (3900 by default).
+For this whole configuration, you must set an alias name: we chose `my-garage`, that you will used for all commands.
+
+Adapt the following command accordingly and run it:
+
+```bash
+mc alias set \
+  my-garage \
+  http://172.20.0.101:3900 \
+  <access key> \
+  <secret key> \
+  --api S3v4
+```
+
+You must also add an environment variable to your configuration to inform MinIO of our region (`garage` by default).
+The best way is to add the following snippet to your `$HOME/.bash_profile` or `$HOME/.bashrc` file:
+
+```bash
+export MC_REGION=garage
+```
+
+## Use `mc`
+
+You can not list buckets from `mc` currently.
+
+But the following commands and many more should work:
+
+```bash
+mc cp image.png my-garage/nextcloud-bucket
+mc cp my-garage/nextcloud-bucket/image.png .
+mc ls my-garage/nextcloud-bucket
+mc mirror localdir/ my-garage/another-bucket
+```