Update README.md

Author: praveensiddu

SimpleServlet/README.md

@@ -1 +1,9 @@
 For code explanation and additional configurations read the tutorial at https://javatutorial.net/java-servlet-example
+
+# Build using command line 
+- Install JDK, Maven
+- git clone https://github.com/JavaTutorialNetwork/Tutorials.git
+- cd Tutorials/SimpleServlet
+- mvn clean
+- mvn package
+| the war file will be built in target/SimpleServlet-1.war