Create blog post to how create a Debezim Source Connector

[kmos]

Description

based on the work done in this PR, we would like to create a blog post that explains, step by step, how to build a Debezium Source Connector, guiding the reader through this CSV-based example.

[kmos]

@yuanglili let me know if I can assign it to you

[yuanglili]

@kmos Thank you. I would like to work on it!