Development setup and documentation

[AlDu2407]

• For development purposes a Docker compose file with a MySQL configuration has been added. It contains default configuration values that can be used with Urchin to create and start an development database.
• Documentation has been updated to ease up the setup process for developing Urchin.
• Added the missing MIT license to the repository.

[matheusgomes28]

Thanks Al! I'll take a look today, like the initial changes so far 😄

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 24.96%. Comparing base (9efb940) to head (66d8ef5).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #56 +/- ## ======================================= Coverage 24.96% 24.96% ======================================= Files 14 14 Lines 661 661 ======================================= Hits 165 165 Misses 477 477 Partials 19 19 ```

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[AlDu2407]

Hi Mat, will implement your suggested changes later on and update the PR. Thanks for the feedback.

[AlDu2407]

Updated PR due to latest feedback and reverted specific parts of the PR.