Readme updates (#29)

* - updated Kafka listener interfaces to support external and internal connections
- added send-demo-message.sh to resources/external-kafka to support sending a sample transaction

Signed-off-by: Dixon Whitmire <dixonwh@gmail.com>

* WIP kafka connector implementation and pydantic union issue

Signed-off-by: Dixon Whitmire <dixonwh@gmail.com>

* - Updated pydantic ConnectorConfigType to use a "discriminating union" to resolve an issue with pydantic 1.9.x
- Update demo-config.yml to include KafkaConsumer configuration
- ToDo: KafkaConsumer integration with Core OS Fast API startup

Signed-off-by: Dixon Whitmire <dixonwh@gmail.com>

* - black formatting
- isort import fixes

Signed-off-by: Dixon Whitmire <dixonwh@gmail.com>

* - updated demo config to include Kafka Consumer
- implemented Kafka Consumer and background task

Signed-off-by: Dixon Whitmire <dixonwh@gmail.com>

* adding isort to primary README

Signed-off-by: Dixon Whitmire <dixonwh@gmail.com>

Author: dixonwhitmire

README.md

@@ -79,3 +79,10 @@ Use [pytest](https://docs.pytest.org/en/7.1.x/) to execute unit tests
 ```shell
 poetry run pytest
 ```
+
+### Tidying Up Imports
+Use [isort](https://pycqa.github.io/isort/) to clean up the project's imports
+
+```shell
+poetry run isort .
+```