Add README & deployment examples

deployment/nginx.conf

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+server {
+        listen 80;
+        listen [::]:80;
+        server_name ledger.example.com;
+
+        location / {
+                auth_basic "private zone";
+                auth_basic_user_file /etc/nginx/myusers;
+
+                proxy_pass http://127.0.0.1:8000;
+        }
+}

deployment/systemd.service

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+[Unit]
+Description=Ledger Quick Note
+
+[Service]
+Type=simple
+User=www-data
+Group=www-data
+WorkingDirectory=/path/to/ledger-quicknote
+ExecStart=/path/to/ledger-quicknote/ledger-quicknote -f /path/to/ledger/journal.txt -w /path/to/ledger
+
+[Install]
+WantedBy=multi-user.target