add h2 and save user info to db

pom.xml

@@ -23,6 +23,7 @@
         <compiler.version>1.8</compiler.version>
         <kafka.version>2.8.0</kafka.version>
         <maven.assembly.plugin.version>3.0.0</maven.assembly.plugin.version>
+        <mybatis-plus-boot-starter.version>3.4.2</mybatis-plus-boot-starter.version>
     </properties>
     <dependencies>
         <dependency>
@@ -52,6 +53,18 @@
             <scope>test</scope>
         </dependency>
 
+        <dependency>
+            <groupId>com.baomidou</groupId>
+            <artifactId>mybatis-plus-boot-starter</artifactId>
+            <version>${mybatis-plus-boot-starter.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>com.h2database</groupId>
+            <artifactId>h2</artifactId>
+            <scope>runtime</scope>
+        </dependency>
+
         <dependency>
             <groupId>org.apache.kafka</groupId>
             <artifactId>kafka-clients</artifactId>