Creating generic mautrix bridge doc

Not a huge fan of how it turned out at all, not sure how to make it better.

docs/configuring-playbook-bridge-mautrix-Generic.md

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+# Setting up a Generic Mautrix Bridge (optional)
+
+The playbook can install and configure bridges with mautrix (Currently twitter, facebook, instagram, signal, hangouts, googlechat)
+
+
+You can see each bridge features at https://github.com/mautrix/SERVICENAME/blob/master/ROADMAP.md
+
+To enable a bridge add
+
+
+```yaml
+matrix_mautrix_SERVICENAME_enabled: true
+```
+
+to your `vars.yml`
+
+There are some additional things you may wish to configure about the bridge before you continue.
+
+You can add
+
+```yaml
+matrix_admin: "@YOUR_USERNAME:{{ matrix_domain }}"
+```
+to 'vars.yml' to configure a user as administrator for all bridges, or you prefer to do it bridge by bridge you can configure it with
+
+```yaml
+matrix_mautrix_SERVICENAME_configuration_extension_yaml: |
+  bridge:
+    permissions:
+      '@YOUR_USERNAME:{{ matrix_domain }}': admin
+```
+
+Encryption support is off by default. If you would like to enable encryption, add the following to your `vars.yml` file:
+```yaml
+matrix_mautrix_SERVICENAME_configuration_extension_yaml: |
+  bridge:
+    encryption:
+      allow: true
+      default: true
+```
+
+
+Using both would look like
+
+```yaml
+matrix_mautrix_SERVICENAME_configuration_extension_yaml: |
+  bridge:
+    permissions:
+      '@YOUR_USERNAME:{{ matrix_domain }}': admin
+    encryption:
+      allow: true
+      default: true
+```
+
+```yaml
+matrix_mautrix_SERVICENAME_appservice_bot_username: "BOTNAME"
+```
+
+Can be used to set the username for the bridge.
+
+
+You may wish to look at `roles/matrix-bridge-mautrix-SERVICENAME/templates/config.yaml.j2` and `roles/matrix-bridge-mautrix-SERVICENAME/defaults/main.yml` to find other things you would like to configure.
+
+
+## Set up Double Puppeting
+
+To set up  [Double Puppeting](https://docs.mau.fi/bridges/general/double-puppeting.html)
+
+please do so automatically, by enabling Shared Secret Auth
+
+The bridge will automatically perform Double Puppeting if you enable [Shared Secret Auth](configuring-playbook-shared-secret-auth.md) for this playbook by adding
+
+```yaml
+matrix_synapse_ext_password_provider_shared_secret_auth_enabled: true
+matrix_synapse_ext_password_provider_shared_secret_auth_shared_secret: YOUR_SHARED_SECRET_GOES_HERE
+```
+
+You should generate a strong shared secret with a command like this: pwgen -s 64 1
+
+This is the recommended way of setting up Double Puppeting, as it's easier to accomplish, works for all your users automatically, and has less of a chance of breaking in the future.
+
+
+
+## Usage
+
+You then need to start a chat with `@SERVICENAMEbot:YOUR_DOMAIN` (where `YOUR_DOMAIN` is your base domain, not the `matrix.` domain). 
+
+Send `login ` to the bridge bot to get started You can learn more here about authentication from the bridge's official documentation on Authentication https://docs.mau.fi/bridges/python/SERVICENAME/authentication.html  .
+
+If you run into trouble, check the [Troubleshooting](#troubleshooting) section below.
+
+
+
+## Troubleshooting
+
+Please see SERVICENAME's individual doc page for troubleshooting information.