Adding comprehensive comments

adminer/docker-compose.yml

@@ -1,13 +1,20 @@
+# Adminer Database Management Tool Configuration
 services:
   adminer:
+    # Basic container configuration
     container_name: adminer
     image: docker.io/library/adminer:5.3.0
     restart: unless-stopped
+    
+    # Network port configuration
     ports:
-      - ${PORT}:8080
+      - ${PORT}:8080  # Maps host port to Adminer web interface
+    
+    # Network configuration
     networks:
-      - backend
+      - backend  # Connects to backend network
 
+# External network definition
 networks:
   backend:
-    external: true
+    external: true  # Uses pre-existing backend network