Initial mautrix-signal Cloudron package

DESCRIPTION.md

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+# Matrix Signal Bridge
+
+A Matrix-Signal puppeting bridge that allows you to use Signal Messenger through Matrix.
+
+## Features
+
+- **Two-way messaging**: Send and receive messages between Matrix and Signal
+- **Media support**: Share images, videos, documents, and other files
+- **Group chats**: Bridge Signal groups to Matrix rooms
+- **Reactions**: React to messages across platforms
+- **Read receipts**: Sync read status between Matrix and Signal
+- **Typing indicators**: See when someone is typing
+- **End-to-bridge encryption**: Optional encryption for messages between Matrix and the bridge
+
+## Setup
+
+After installation:
+
+1. Copy the registration file from `/app/data/registration.yaml` to your Matrix homeserver
+2. Add the registration to your homeserver configuration and restart it
+3. Start a chat with `@signalbot:yourdomain.com` in Matrix
+4. Follow the authentication instructions to link your Signal account
+
+For detailed setup instructions, visit the [official documentation](https://docs.mau.fi/bridges/go/signal/index.html).