Add guide

op_guide/plume/README.md

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+  1. Bind nomad on your machine with SSH (check the README file at the root of this repo)
+  2. Go to http://127.0.0.1:4646
+  3. Select `plume` -> click `exec` button (top right)
+  4. Select `plume` on the left panel
+  5. Press `enter` to get a bash shell
+  6. Run:
+
+```bash
+plm users new \
+  --username alice \
+  --display-name Alice \
+  --bio Just an internet user \
+  --email alice@example.com \
+  --password s3cr3t
+```
+
+That's all folks, now you can use your new account at https://plume.deuxfleurs.fr
+