docs(readme): add code references to flow

README.md

@@ -31,7 +31,17 @@ Navigate to each directory and follow the instructions in their respective READM
 
 ## Solution Overview
 
-<img src="./solution-diagram.png" alt="Solution" width="100%"/>
+<img src="./solution-diagram.png" alt="Solution" width="100%"/><br>
+
+Code references:
+
+1. Predict game result: [PredictionGame.sol#L116](./contracts/contracts/SportsPredictionGame.sol#L116)
+2. Check for finished games: [PredictionGame.sol#379](./contracts/contracts/SportsPredictionGame.sol#L379)
+3. Request game result: [ResultsConsumer.sol#L65](./contracts/contracts/ResultsConsumer.sol#L65)
+4. Fetch game result: [sports-api.js#L63](./contracts/sports-api.js#L63)
+5. Fulfill game result request [ResultsConsumer.sol#L105](./contracts/contracts/ResultsConsumer.sol#L105)
+6. Claim winnings [SportsPredictionGame.sol#L151](./contracts/contracts/SportsPredictionGame.sol#L151)<br>
+   6.1 Transfer winnings [NativeTokenSender.sol#L66](./contracts/contracts/ccip/NativeTokenSender.sol#L66)
 
 ## Resources