Add WhatsApp bridge setup guide and update .gitignore

.gitignore

@@ -3,4 +3,8 @@
 *.log
 tmp/
 
-./config/dendrite/*
+# Dendrite config
+config/dendrite/
+
+# Mautrix-Whatsapp config
+config/mautrix-whatsapp/*.yaml

config/mautrix-whatsapp/README.md

@@ -1 +1,116 @@
-# TODO
+# WhatsApp Bridge Setup Guide
+
+This guide will help you set up the WhatsApp bridge for your Dendrite Matrix server.
+
+## Prerequisites
+
+Before starting, ensure that:
+- Dendrite is properly configured and running.
+- The `whatsapp` database was created during the initial setup.
+- You have your domain name ready.
+
+## Setup Steps
+
+1. Navigate to the WhatsApp configuration directory:
+
+```sh
+cd config/mautrix-whatsapp
+```
+
+2. Generate the initial configuration file:
+
+```sh
+docker run --rm -v `pwd`:/data:z dock.mau.dev/mautrix/whatsapp
+```
+
+3. Edit the generated `config.yaml` file. You may need administrative privileges (sudo) to edit this file.
+
+### Required Configuration Changes
+
+Make the following modifications to your `config.yaml`:
+
+#### Homeserver Settings
+```yaml
+homeserver:
+    address: http://monolith:8008  # Internal Docker network address
+    domain: your.domain.com        # Replace with your actual domain
+```
+
+#### Appservice Settings
+```yaml
+appservice:
+    address: http://whatsapp:29318  # Internal bridge address
+    hostname: 0.0.0.0               # Listen on all interfaces
+```
+
+#### Bridge Permissions
+```yaml
+bridge:
+    permissions:
+        "*": relay
+        "your.domain.com": user           # Replace with your domain
+        "@yourusername:your.domain.com": admin  # Replace with your Matrix ID
+```
+
+#### Database Connection
+Update the database URI to use the WhatsApp-specific database. For example:
+
+```yaml
+# Original:
+# postgres://dendrite:password@postgres/dendrite?sslmode=disable
+
+# Modified (note 'whatsapp' database name):
+postgres://dendrite:password@postgres/whatsapp?sslmode=disable
+```
+
+4. Generate the registration file:
+
+```sh
+docker run --rm -v `pwd`:/data:z dock.mau.dev/mautrix/whatsapp
+```
+
+5. Configure Dendrite to use the WhatsApp bridge by editing `config/dendrite/dendrite.yaml`:
+
+```yaml
+app_service_api:
+    config_files: 
+        - "/etc/whatsapp/registration.yaml"
+```
+
+## Starting the Bridge
+
+1. Start the WhatsApp bridge service:
+
+```sh
+docker compose up -d mautrix-whatsapp
+```
+
+2. Restart Dendrite to load the new bridge configuration:
+
+```sh
+docker compose restart monolith
+```
+
+## Verifying the Setup
+
+1. Check if the bridge is running:
+
+```sh
+docker compose logs mautrix-whatsapp
+```
+
+You should see messages indicating the bridge has started successfully.
+
+## Next Steps
+
+- Set up your WhatsApp account in Matrix by starting a chat with `@whatsappbot:your.domain.com`.
+- Follow the bot's instructions to link your WhatsApp account.
+- Once configured, you can proceed to set up the [Telegram Bridge](../mautrix-telegram/README.md).
+
+## Troubleshooting
+
+If you encounter issues:
+- Verify all configuration files have the correct permissions.
+- Check the bridge logs using `docker compose logs mautrix-whatsapp`.
+- Ensure the database connection string is correct.
+- Verify the Dendrite configuration includes the correct path to the registration file.