feat: add etherscan configs (#19)

Author: roderik

hardhat.config.ts

@@ -22,6 +22,12 @@ const config: HardhatUserConfig = {
         : 'auto',
     },
   },
+  etherscan: {
+    apiKey: process.env.ETHERSCAN_API_KEY,
+  },
+  sourcify: {
+    enabled: true,
+  }
 };
 
 export default config;