chore: add Cronos deployment artifacts and update deployment documentation

Author: hanzel98

.env.example

@@ -21,6 +21,7 @@ GNOSISSCAN_API_KEY=
 BINANCESCAN_API_KEY=
 BERACHAIN_API_KEY=
 UNICHAIN_API_KEY=
+CRONOS_API_KEY=
 
 
 # RPC URLs
@@ -40,6 +41,7 @@ ARBITRUM_NOVA_RPC_URL=https://nova.arbitrum.io/rpc
 SEI_RPC_URL=https://evm-rpc.sei-apis.com
 INK_RPC_URL=https://rpc-gel.inkonchain.com
 SONIC_RPC_URL=https://rpc.soniclabs.com
+CRONOS_RPC_URL=https://evm.cronos.org
 
 # Testnets
 SEPOLIA_RPC_URL=https://sepolia.infura.io/v3/${RPC_API_KEY}
@@ -58,3 +60,4 @@ CITREA_TESTNET_RPC_URL=https://rpc.testnet.citrea.xyz/
 INK_SEPOLIA_RPC_URL=https://rpc-gel-sepolia.inkonchain.com
 SONIC_TESTNET_RPC_URL=https://rpc.testnet.soniclabs.com
 HOODI_RPC_URL=https://hoodi.infura.io/v3/${RPC_API_KEY}
+CRONOS_TESTNET_RPC_URL=https://cronos-testnet.drpc.org