update README

Author: Satendra Kumar

README.md

@@ -1 +1,14 @@
 # es-java-client-sample
+ Prerequisite : Java 8 and Later version 
+
+### Start ElasticSearch
+    1) Download elasticsearch from [here](https://www.elastic.co/downloads/elasticsearch)    
+    2) Extract downloaded elasticsearch
+    3) cd elasticsearch-X.X.X    
+    4) $ bin/elasticsearch    
+ 
+
+### Run project 
+    $ mvn package
+    $ mvn exec:java -Dexec.mainClass="com.es.app.ESApp"
+