Add instructions.md

Add StartOS instructions

instructions.md

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+# Munin-bitcoin
+
+You've installed Munin-bitcoin — a Bitcoin watch-only wallet and transaction monitoring service for StartOS.
+
+## What you get on StartOS
+
+- Bitcoin transaction monitoring
+- Watch-only wallet support
+- BIP-329 label import/export (planned)
+- Transaction notifications with label reminders (planned)
+
+## Getting started
+
+Munin-bitcoin is currently in early development.
+
+The service currently provides a basic web interface while the core Bitcoin wallet and label management features are being developed.
+
+To access Munin-bitcoin:
+
+1. Open the Munin-bitcoin service in StartOS.
+2. Open the **Web UI** interface.
+
+## Development status
+
+Munin-bitcoin is under active development.
+
+Planned features:
+
+- Import and export of BIP-329 JSON/JSONL label files
+- Bitcoin transaction monitoring
+- Wallet label management
+- Notifications asking users to update transaction labels