新增说明及示例文件；更新README.md

examples/mysql/8/compose.yaml

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+version: "3.9"
+
+services:
+  mysql:
+    image: mysql:8.0.34
+    container_name: mysql
+    hostname: mysql
+    restart: always
+    networks:
+      - db_network
+    ports:
+      - "3306:3306"
+    volumes:
+      - /etc/localtime:/etc/localtime:ro
+      - mysql_db:/var/lib/mysql
+    configs:
+      - source: mysql_conf
+        target: /etc/mysql/conf.d/my.cnf
+        mode: 0444
+    secrets:
+      - mysql_root_key
+    environment:
+      - MYSQL_ROOT_PASSWORD_FILE=/run/secrets/mysql_root_key
+
+volumes:
+  mysql_db:
+
+configs:
+  mysql_conf:
+    file: my.cnf
+
+secrets:
+  mysql_root_key:
+    file: root.key
+
+networks:
+  db_network:
+    name: db_network
+    external: true
+#    driver: bridge
+#    driver_opts:
+#      encrypted: 'true'
+#    ipam:
+#      driver: default
+#      config:
+#        - subnet: 172.21.0.1/24

examples/mysql/8/my.cnf

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+[mysqld]
+max_connections = 1000
+character-set-server = utf8mb4
+collation-server = utf8mb4_unicode_ci

examples/mysql/8/root.key

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+msQijJXzLmeEfmy3j5nQBn7hsVFbd6F3