Add writer to token index deploy in eth tests

cic/ext/eth/start.py

@@ -4,6 +4,11 @@ from chainlib.eth.connection import RPCConnection
 
 
 def extension_start(network, *args, **kwargs):
+    """Called by the "export" cli tool subcommand for initialization of the eth extension.
+
+    :param network: Network object to read and write settings from
+    :type network: cic.network.Network
+    """
     CICRegistry.address = kwargs['registry_address']
 
     RPCConnection.register_location(kwargs['rpc_provider'], kwargs['chain_spec'])