Add mvn clean compile step

docs/Development-IDE.md

@@ -38,6 +38,7 @@ Once all UTs are passed after you modify codes, your modification basically work
 ## IDEA
 
 * "File" -> "Open" -> choose the root path of IoTDB source code. 
+* use `mvn clean compile -Dmaven.test.skip=true`to get target.
 * mark directory ***iotdb/target/generated-sources/antlr3*** as source code
 * mark directory ***service-rpc/target/generated-sources/thrift*** as source code 
 
@@ -61,4 +62,4 @@ The main class of IoTDB cli is `org.apache.iotdb.client.Client`
 
 You can run/debug IoTDB by using the two classes as the entrance.
 
-Another way to understand IoTDB is to read and try Unit Tests.
+Another way to understand IoTDB is to read and try Unit Tests.
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