Create app_mautrix_signal.md

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+---
+title: Matrix Signal bridge
+template: docs
+taxonomy:
+    category: docs, apps
+routes:
+  default: '/app_mautrix_signal'
+---
+
+[![Installer Matrix Signal bridge with YunoHost](https://install-app.yunohost.org/install-with-yunohost.svg)](https://install-app.yunohost.org/?app=mautrix_signal) [![Integration level](https://dash.yunohost.org/integration/mautrix_signal.svg)](https://dash.yunohost.org/appci/app/mautrix_signal)
+
+### Index
+
+- [Useful links](#useful-links)
+
+*Matrix Signal bridge* is a membership management web application towards non profit organizations. This is before all a free software (as in free speech), community and free (as in beer)! Matrix Signal bridge works on any web server that handle PHP.
+
+### Disclaimers / important information
+
+#### List of known public services
+
+* Ask on one of the following rooms: #mautrix_yunohost:matrix.fdn.fr or #signal:maunium.net
+
+### Bridging usage
+** Note that several Signal and Matrix users can be bridged, each Signal account has its own bot administration room. If they are in a same Signal group, only one matrix room will be created. **
+
+#### Bridge a Signal user and a Matrix user
+* First your Matrix user or Synapse Server has to be authorized in the Configuration of the bridge (see below)
+* Then, invite the bot (default @signalbot:yoursynapse.domain) in this new Mautrix-Signal bot administration room.
+  * If the Bot does bot accept, see the [troubleshooting page](https://docs.mau.fi/bridges/general/troubleshooting.html)
+* Send ``!sg help`` to the bot in the created room to know how to control the bot.
+See also [upstream wiki Authentication page](https://docs.mau.fi/bridges/python/signal/authentication.html)
+
+#### Linking the Bridge as a secondary device
+* Type ``!sg link``
+* Open Signal App of your primary device
+* Open Settings => Linked Devices => + => Capture the QR code with the camera
+* By defaults, only conversations with very recent messages will be bridged
+* Accept invitations to the bridged chat rooms
+
+#### Registering the Bridge as a primary device
+* Type ``!sg register <phone>``, where ``<phone>`` is your phone number in the international format with no space, e.g. ``!sg register +33612345678``
+* Answer in the bot room with the verification code that you reveived in SMS.
+* Set a profile name with ``!sg set-profile-name <name>``
+
+### Double puppeting
+* Log in with ``login-matrix <access token>``
+* After logging in, the default Matrix puppet of your Signal account should leave rooms and your account should join all rooms the puppet was in automatically.
+
+
+### Relaybot: Bridge a group for several Matrix and several Signal users to chat together
+* Create a room on the signal side
+* Your bridged users will be invited on the Matrix side once they are invited on the Signal side
+* You can invite more people over on the Matrix side
+* Have one of the bridged users (who has the right permission) type `!sg set-relay` on the Matrix side. Their signal account will relay messages from other Matrix users
+It is not yet possible to bridge to an existing signal room, or create a new signal room from the Matrix side.
+
+## Configuration of the bridge
+
+The bridge is [roughly configured at installation](https://github.com/YunoHost-Apps/mautrix_signal_ynh/blob/master/conf/config.yaml), e.g. allowed admin and user of the bot. Finer configuration can be done by modifying the
+following configuration file with SSH: 
+```
+/opt/yunohost/mautrix_signal/config.yaml
+```
+and then restarting the mautrix_signal service.
+
+## Useful links
+
++ Website: [mautrix_signal.eu (en)](https://mautrix_signal.eu/site/)
++ Demonstration: [Demo](https://demo.mautrix_signal.eu/login)
++ Application software repository: [github.com - YunoHost-Apps/mautrix_signal](https://github.com/YunoHost-Apps/mautrix_signal_ynh)
++ Fix a bug or an improvement by creating a ticket (issue): [github.com - YunoHost-Apps/mautrix_signal/issues](https://github.com/YunoHost-Apps/mautrix_signal_ynh/issues)