feat: Implemented Monolithic Architecture according to the guidelines provided by issue #2664 (#3111)

* added a pom.xml file for the monolithic structure, set up MVC file structure, and added basic model files using H2 database since its light and efficient

* added a pom.xml file for the monolithic structure, set up MVC file structure, and added basic model files using H2 database since its light and efficient

* Added "controllers" and repository classes to communicate with database to maintain code cleanliness

* added application.properties file for springboot, added controller classes and used the CLI main class from the previous submission and enhanced upon it

* fixed checkstyle comments

* fixed testing class

* automatically generated puml

* Readme File

Added Detailed Readme File in the md format

* attempting to fix some debugging issues

added more test cases, and tried to fix pom.xml

* dropped change

* another attempted fix

* added more test cases

* Fixes

Renamed the main module/directory. Added more content to the readme.md file. fixed the orElseThrow statements

Fixes

Renamed the main module/directory. Added more content to the readme.md file. fixed the orElseThrow statements

* fixed naming and readme file

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Co-authored-by: Ilkka Seppälä <iluwatar@users.noreply.github.com>