added doc

Author: ToGoBananas

Readme.md

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+### Usage:
+
+Each node should run instance of `MoleculerNode` class. Node id can be specified on initialization.
+
+To configure node you must edit `moleculer/service.py` file.
+
+Service configuration in `INFO_PACKET_TEMPLATE`
+
+To handle requests from other nodes (call, dcall), you must implement `request_handler` function.
+
+To handle events (emit, broadcast), you must implement `event_handler`.
+