添加 example_mysql_ddl.md

example_mysql_ddl.md

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+建表语句：
+
+```sql
+CREATE TABLE `example_table` (
+    `id` BIGINT NOT NULL COMMENT 'ID',
+    `str_field` VARCHAR(32) NOT NULL COMMENT '字符串`,
+    `int_field` INT DEFAULT NULL COMMENT '整数`,
+    `long_field` BIGINT DEFAULT NULL COMMENT '长整数`,
+    `decimal_field` DECIMAL(14, 2) DEFAULT NULL COMMENT '高精度浮点数`,
+    `date_field` DATE NOT NULL COMMENT '日期类型`,
+    `time_field` DATETIME NOT NULL COMMENT '日期类型`,
+    `state` VARCHAR(32) NOT NULL COMMENT '状态：only_read、read_write',
+    `json_field` JSON DATETIME NULL COMMENT 'JSON类型'
+    PRIMARY KEY (`id`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci COMMENT='示例表';
+```