Update README.md

Author: manfredipist

README.md

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 O2K-Connector is a lightweight connector, built in Python, that enables context data sharing from Orion Context Broker towards Apache Kafka. In more detail, O2K-Connector subscribes to Orion Context Broker and publishes the received context-data to a built-in kafka topic.
 
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 ## O2K-Connector example placement in a FIWARE/Apache Architecture
 
 # ![O2K-Connector-placement](docs/images/schema.png)