Update start message text

Update `README.md` file

Update license from `GPL-3.0` to `MIT`

Update song search process (#38)

Fix long open database sessions when processing music download requests (#37)

Refactor `check_downloaded_track_ages` task (#36)

Add new `MAX_SONGS_PER_DOWNLOAD_REQUEST` setting (#35)

Add new `MAX_TRACK_STORAGE_SIZE` setting (#34)

Fix music download queue system (#33)

Create new `MAX_PARALLEL_MUSIC_DOWNLOADS` setting (#32)

Create system to queue music download requests (#31)

Refactor `.gitignore` file

Add `joined_date` field to `User` model (#30)

Add and configure `Alembic` for future db migrations (#29)

Update core settings (#28)