message: feat: add mocknet network config
diff: @@ -86,3 +86,9 @@ export class StacksTestnet extends StacksMainnet implements StacksNetwork {
  chainId = ChainID.Testnet;
  coreApiUrl = 'http://testnet-master.blockstack.org:20443';
  }
  +
  +export class StacksMocknet extends StacksMainnet implements StacksNetwork {
  + version = TransactionVersion.Testnet;
  + chainId = ChainID.Testnet;
  + coreApiUrl = 'http://localhost:3999';
  +}
  