User authentication service

[shahrzadav]

Description

This PR includes a new use-case in the CogniCrypt code generator. The new use-case has 2 parts, password generator, and user authentication service. The first one creates a secure random password of a length of 12 characters (this is editable by the user). User authentication service provides an authority check service via SQL database, where the user enters a username and a password, and the service checks if it exists in the database and returns a boolean.

Fixes #17

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [x] This change requires a documentation update

How Has This Been Tested?

Tests are provided for both cases in the codegenerator.test.

Test Configuration:

• Eclipse Version: 2019-06
• Java Version: 1.8
• OS: Windows 10

Checklist:

• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes

[shahrzadav]

@AnakinSklavenwalker