How To Generate Extent Reports In Selenium

testngClasses.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd">
<suite name="Extent Report in Parallel by Classes">
   <test name = "Parallel Tests by Classes" parallel = "classes" thread-count="3">
       <classes>
           <class name="ParallelExecution.InputFormTests"/>
           <class name="ParallelExecution.AlertTests" />
       </classes>
   </test> <!-- Test -->
</suite> <!-- Suite -->