Add script to validate proxy connection (#9)

* Add script to validate proxy connection

* Bump up the version

Author: sudharsan-selvaraj

docs/certificate-installation.md

@@ -15,3 +15,20 @@
 4. Make sure the installed certificate is displayed under `User` section of `Trusted Credentials` settings.
 
 <img src="./ca_install_steps.gif">
+
+5. Install the plugin by running the command 
+
+    ```shell
+    appium plugin install --source=npm appium-interceptor-plugin
+    ```
+6. To Make sure your setup is working connect your android device/emulator to your machine and run the below command
+    
+    ```shell
+    appium plugin run appium-interceptor test-connection
+    ```
+
+    A new browser session will be started in the mobile and you should see the below page opened
+     
+    <img src="./test-connection.gif">
+
+If you see any errors then retry from step 1 or you can raise an issue with the screeshot and we will guide you with the next steps.