Remaking the project.

[Mert18]

Project will be re-maked using the industry standards. New version will include:

Issues are not ordered anyway.

• [x] User authentication and authorization with Spring Security. #8
• [x] New features such as learning words and tracking user processes. #9
• [x] PostgreSQL will be used, mongodb data will be migrated to Postgre. #10
• [x] Email Integration #18
• [x] Words endpoint will be created. #11
• [x] Complete Unit tests.

[Mert18]

Most important parts completed, branch will be merged as soon as the frontend is ready.

[Mert18]

We got a long way with e59597151b5a6fb264569024cd70794e162d05fe