Added instructions for running H2 server

h2/MAVEN.md

@@ -42,4 +42,12 @@ H2 uses [Maven Wrapper](https://github.com/takari/maven-wrapper) setup, you can
 
 or
 
-> $ ./mvnw.cmd clean test
+> $ ./mvnw.cmd clean test
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+
+###Running
+
+You can run the server like this
+
+```
+mvn exec:java -Dexec.mainClass=org.h2.tools.Server  
+```
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