Update Readme.md

Author: anshooarora

Readme.md

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+## extentreports-cucumber2-adapter
+
+### Docs
+
+See [here](http://extentreports.com/docs/versions/4/java/cucumber2.html) for complete docs.
+
+### Usage
+
+To begin using the adapter, add the com.aventstack.extentreports.cucumber.adapter.ExtentCucumberAdapter plugin to the runner.
+
+```java
+`@RunWith(Cucumber.class)
+@CucumberOptions(plugin = {"com.aventstack.extentreports.cucumber.adapter.ExtentCucumberAdapter:"})
+public class RunCukesTest {
+	// ..
+}
+```
+
+### License
+
+extentreports-cucumber2-adapter is MIT licensed.