Added README and shell

README.md

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+# BTCPay Server Deployment
+
+This project deploys a BTCPay Server with a Bitcoin node using Nix.
+
+## Prerequisites
+
+- **Nix package manager** - If you're not using NixOS, install from https://nixos.org/download/
+- **SSH keys configured** for root access to your target server
+
+## Setup
+
+1. **Configure your server**: Edit `REMOTE_HOST` in `justfile` to point to your server
+2. **SSH access**: Ensure you have SSH keys configured for root access to your target server
+
+## Quick Start
+
+```bash
+# Enter development environment (provides just automatically)
+nix-shell
+
+# Build configuration
+just build
+
+# Deploy to server
+just deploy
+
+# Check status
+just status
+```
+
+## What You Need
+
+The `shell.nix` provides `just` and everything else needed. If you already have `just` installed, you can skip `nix-shell` and run the commands directly.