Organize Kafka Connectors

[jaredpetersen]

It may be a good idea to organize the connectors by who made them. For example, there are multiple MongoDB connectors:

• https://github.com/hpgrahsl/kafka-connect-mongodb
• https://github.com/DataReply/kafka-connect-mongodb
• https://github.com/Landoop/stream-reactor/tree/master/kafka-connect-mongodb

This has already become an issue in this repository: #2

Proposed format:

• MongoDB
  • Data Reply kafka-connect-mongodb
  • Hans-Peter Grahsl kafka-connect-mongodb
  • Landoop kafka-connect-mongodb

And for cases where there is only one connector available:

• JDBC
  • Confluent kafka-connect-jdbc

Particular implementations should probably be listed in alphabetical order as well.