Finish part of the design and deployment for real-time data processing and storage system

[kcf-jackson]

Thanks for the update @D940465942

A few things to fix:

• Please remove all the code and submit them to the code repo instead.
• Please use markdown instead of pdf as the output format. For diagrams, you can take a screenshot and save it as an image to be included in the markdown document.
• Please add the _category_.json like the other subfolders did. The documentation website needs that to index your document.

[kcf-jackson]

Thanks for the fix.

• You have section 6.5, 7.6, and 7.7 following 2.4. Please fix the section number.
• After the application is set up, please give an example how to communicate with the server, e.g. how to send and fetch data?
• Please add a reference section to include links to relevant resources, e.g., MQTT, Kafka, MongoDB, etc.