feat: add setup an email on alpha

docs/easycozy/tips.md

@@ -59,3 +59,12 @@ Type `yes` to continue.
 
 A browser window will be opened asking for authorization to access to your file.
 Just click on "Authorize" to keep on with the doctype dropping.
+
+## Set up an email
+
+The `create_instance.sh` script will create an instance but without an email address. The settings from the home are not accessible so you need to manually set the email address. To do so, [connect to the couchDB from alpha](../ecolyo/Technical/environments.md#couchdb-from-alpha) and access the `io-cozy-settings` database. Edit the `io.cozy.settings.instance` entry and add your email.
+
+```json title="io.cozy.settings.instance"
+"email": "email@test.com",
+"public_name": "Axelle Hair"
+```