update maven readme file.

Maven command line for kinetic

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NOTE: please see build.setup.read for Prerequisite to build kinetic-java projects. 

NOTE: please verify all the required "Suggested Development Environments" are satisfied as stated at the link (README.md):

https://github.com/Seagate/kinetic-java 

To build kinetic-java projects, run maven commond line in <Kinetic-Folder> or in <Kinetic-Folder>/"submodule-name":

NOTE: Please also verify that JAVA_HOME is defined in your development environment:

http://maven.apache.org/download.cgi

1, Run "mvn clean install". 

To build kinetic-java projects, run maven command line in <Kinetic-Folder>:

2, Build kinetic:

1. Build/compile kinetic:

   mvn clean compile

   If don't want to sync protocol file from protocol repo, the maven command line is:

   mvn clean compile -DskipProtoSync

3, Execute unit test cases:

2. Execute unit test cases:

   mvn clean test

4, Build kinetic package:

3. Build kinetic package:

   mvn clean package

   To skip test cases:

   mvn clean package -Dmaven.test.skip=true or mvn clean package -DskipTests

   To skip sync kinetic.proto file with kinetic-protocol repository (for example, no Internet connections, etc): 

   mvn clean compile -DskipProtoSync

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