Update README.md

Author: captain-woof

README.md

@@ -6,16 +6,23 @@ CazzPay is a crypto off-ramping platform that facilitates sellers to allow payme
 
 This repo contains all the code that runs CazzPay - all smart contracts, subgraph code and the frontend.
 
-## CazzPay contracts
+## Demo 💰
+
+**[Watch the demonstration on YouTube](https://youtu.be/nb0aalmgfjY)**
+
+## CazzPay contracts 👨‍💻
 
 **Deployed on Rinkeby**
 
 - [TestCoin ($TST)](https://rinkeby.etherscan.io/address/0x6A308Fb8391Cecd7bb9570840239956f25C101F9) - **0x6A308Fb8391Cecd7bb9570840239956f25C101F9**
 - [CazzPayToken ($CZP)](https://rinkeby.etherscan.io/address/0x8d7b5E919620D2C9742389bc1CeC671eaB0E3150) - **0x8d7b5E919620D2C9742389bc1CeC671eaB0E3150**
 - [CazzPay](https://rinkeby.etherscan.io/address/0xDBbD3EF86b6F1a250f542F21362FeA46c28F037c) - **0xDBbD3EF86b6F1a250f542F21362FeA46c28F037c**
 
-## CazzPay graph
+## CazzPay graph 👨‍💻
 
 - **Playground** - [https://thegraph.com/hosted-service/subgraph/captain-woof/cazzpay](https://thegraph.com/hosted-service/subgraph/captain-woof/cazzpay)
 - **Query endpoint** - [https://api.thegraph.com/subgraphs/name/captain-woof/cazzpay](https://api.thegraph.com/subgraphs/name/captain-woof/cazzpay)
 
+## Whitepaper 📚
+
+[Read our whitepaper](https://docs.google.com/document/d/1RGdQedJU52NH_dRy4xOXMyZDAIp_M3-6qlyT_bZHWyY/edit?usp=sharing) to get a better understanding of CazzPay and how it manages everything.