Update Readme.md

Author: anshooarora

Readme.md

@@ -8,6 +8,63 @@ See [here](http://extentreports.com/docs/versions/4/java/testng.html) for comple
 
 See the [Listeners](http://extentreports.com/docs/versions/4/java/testng.html#listeners) section for usage instructions.
 
+### Examples
+
+An example project is available [here](https://github.com/extent-framework/examples/tree/master/extentreports-testng-adapter-example) to understand the usage.
+
+Note: when using this adapter, you are not required to add any code in your project. The adapter works for you to generate the report, perform auto-configuration through the configuration file, and you can also enable/disable reporters from the properties file.
+
+See [this](https://github.com/extent-framework/examples/blob/master/extentreports-testng-adapter-example/src/test/java/com/aventstack/extentreports/adapter/testng/tests/SimpleAssertTests.java) example of how a test is created, marked with the listener.  Note: a good approach is to mark a common base class with the `@Listener` only once.
+
+```
+import com.aventstack.extentreports.testng.listener.ExtentITestListenerClassAdapter;
+
+@Listeners({ExtentITestListenerClassAdapter.class})
+public class SimpleAssertTests {
+
+    @Test
+    public void passTest() {
+        Assert.assertTrue(true);
+    }
+    
+    @Test
+    public void failTest() {
+        Assert.assertTrue(false);
+    }
+    
+}
+```
+
+Configuration can be added under `src/test/resources` as shown [here](https://github.com/extent-framework/examples/tree/master/extentreports-testng-adapter-example/src/test/resources).  Note the contents of `extent.properties` which can be used to enable/disable reporters, set path to the configuration file, and also to output to a desired location.
+
+```
+extent.reporter.avent.start=false
+extent.reporter.bdd.start=false
+extent.reporter.cards.start=false
+extent.reporter.email.start=false
+extent.reporter.html.start=true
+extent.reporter.klov.start=false
+extent.reporter.logger.start=false
+extent.reporter.tabular.start=false
+
+extent.reporter.avent.config=
+extent.reporter.bdd.config=
+extent.reporter.cards.config=
+extent.reporter.email.config=
+extent.reporter.html.config=src/test/resources/html-config.xml
+extent.reporter.klov.config=
+extent.reporter.logger.config=
+extent.reporter.tabular.config=
+
+extent.reporter.avent.out=test-output/AventReport/
+extent.reporter.bdd.out=test-output/BddReport/
+extent.reporter.cards.out=test-output/CardsReport/
+extent.reporter.email.out=test-output/EmailReport/ExtentEmail.html
+extent.reporter.html.out=test-output/HtmlReport/ExtentHtml.html
+extent.reporter.logger.out=test-output/LoggerReport/
+extent.reporter.tabular.out=test-output/TabularReport/
+```
+
 ### License
 
 extentreports-testng-adapter is MIT licensed.