Update README.md

Author: gcp-development

README.md

@@ -41,6 +41,11 @@ Interact with our Substrate Smart Contracts Node using the Contracts UI:
 
 ![image](https://user-images.githubusercontent.com/76512851/199269077-e29144e7-e288-41c0-be51-9060bc16aebd.png)
 
+[Polkadot/Substrate Portal](https://polkadot.js.org/apps/#/explorer)
+
+![image](https://user-images.githubusercontent.com/76512851/201645371-283412c9-86a4-470d-8f80-dcd2dbd50cb8.png)
+
+
 References:<br/>
 [Substrate Stack Exchange](https://substrate.stackexchange.com/)<br/>
 [Smart Contracts](https://wiki.polkadot.network/docs/build-smart-contracts)<br/>