added contribution link (#71)

Author: HaidarEzio

README.md

@@ -30,6 +30,9 @@ or npm:
 
 `npm install @traderxyz/nft-swap-sdk`
 
+You can check out an example project [here](https://nft-swapping-demo.vercel.app/) 
+or check out the example repo [here](https://github.com/HaidarEzio/NFTswap/tree/example-project)
+
 ## Configuration
 
 To use the SDK, create a new NftSwap instance.