Doc Update [ Important data formats ]

* **I'm submitting a ...**
- [ ] bug report
- [ ] feature request
- [x] change/modification
- [ ] design issue

* **What is the current behavior?**

There are no references for a lot of the main data structures utilized in various modules of the application for analytics and processing. Also since all of the functionality is based on the information contained in these units it's essential to have a close look at them including the structure / hierarchy / fields / types etc. Mainly the extracted or mined data from raw json as it is the main source.

* **What is the expected behavior?**

A diagrammatic or chart like representation of all the primary DS used in different modules for analysis. If transformation has been done then need to show those too.

* **What is the motivation / use case for changing the behavior?**

Will be helpful in better understanding the project and gaining familiarity with it.