Add maubot configuration docs

docs/configuring-playbook-bot-maubot.md

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+# Setting up maubot (optional)
+
+The playbook can install and configure [maubot](https://github.com/maubot/maubot) for you.
+
+After setting up maubot, you can use the web management interface to make it do things.
+The default location of the management interface is `matrix.<your-domain>/_matrix/maubot/`
+
+See the project's [documentation](https://docs.mau.fi/maubot/usage/basic.html) to learn what it
+does and why it might be useful to you.
+
+## Adjusting the playbook configuration
+
+Add the following configuration to your `inventory/host_vars/matrix.DOMAIN/vars.yml` file:
+
+```yaml
+matrix_bot_maubot_enabled: true
+matrix_bot_maubot_admins:
+  - yourusername: securepassword
+```
+
+You can add multiple admins.
+
+
+## Installing
+
+After configuring the playbook, run the [installation](installing.md) command again:
+
+```
+ansible-playbook -i inventory/hosts setup.yml --tags=setup-all,start
+```
+
+## Usage
+
+You can visit `matrix.<your-domain>/_matrix/maubot/` to manage your available plugins, clients and instances.
+To add a client you first need to create an account and obtain a valid access token.
+
+## Registering the bot user
+
+You **need to register the bot user manually** before setting up the bot. You can use the playbook to [register a new user](registering-users.md):
+
+```
+ansible-playbook -i inventory/hosts setup.yml --extra-vars='username=bot.maubot password=PASSWORD_FOR_THE_BOT admin=yes' --tags=register-user
+```
+
+Choose a strong password for the bot. You can generate a good password with a command like this: `pwgen -s 64 1`.
+
+## Obtaining an admin access token
+
+This can be done via `mbc auth` (see the [maubot documentation](https://docs.mau.fi/maubot/usage/cli/auth.html)) or  by logging into Element/Schildichat with the bot account
+(using the password you set) and navigate to `Settings->Help&About` and scroll to the bottom.
+You can expand "Access token" to copy it.
+
+![Obatining an admin access token with Element](assets/obtain_admin_access_token_element.png)
+
+**IMPORTANT**: once you copy the token, just close the Matrix client window/tab. Do not "log out", as that would invalidate the token.
+
+
+
+
+
+
+