feat: improved guide on readme

README.md

@@ -25,3 +25,25 @@ All subsequent domains I want to point to a home server service will have a CNAM
 ```
 git.gerardgascon.com.    IN    CNAME    vps.gerardgascon.com.
 ```
+
+## Steps to add a new service
+
+1. Add CNAME record to DNS
+2. Modify nginx.conf to add support for the new service:
+   ```nginx configuration
+    server {
+        listen 443 ssl;
+        server_name <<url>>;
+
+        ssl_certificate /etc/letsencrypt/live/<<url>>/fullchain.pem;
+        ssl_certificate_key /etc/letsencrypt/live/<<url>>/privkey.pem;
+
+        location / {
+            proxy_pass http://<<tailnet_ip>>:<<service_port>>/;
+        }
+    }
+   ```
+3. Request SSL certificate and deploy:
+   ```shell
+   docker compose stop nginx && certbot certonly --standalone -d <<url>> --expand && docker compose up -d
+   ```