新增说明及示例文件；更新README.md

examples/phpmyadmin/compose.yaml

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+version: "3.9"
+
+services:
+  phpmyadmin:
+    image: phpmyadmin:5.2.1
+    container_name: phpmyadmin
+    hostname: phpmyadmin
+    restart: always
+    networks:
+      - db_network
+    ports:
+      - "80:80"
+    volumes:
+      - /etc/localtime:/etc/localtime:ro
+    environment:
+      - PMA_ARBITRARY=1
+
+networks:
+  db_network:
+    name: db_network
+    external: true
+#    driver: bridge
+#    driver_opts:
+#      encrypted: 'true'
+#    ipam:
+#      driver: default
+#      config:
+#        - subnet: 172.21.0.1/24