Melodia

----------------

Added


- MIDI reader capable of reading files written by melodia MIDI writer: ``melodia.io.midi.MIDIWriter``
- Methods ``load`` and ``loads`` in ``melodia.io.midi``
- Chords module: ``melodia.music.chord``
- Tests for MIDI writer
- Tests for MIDI reader
- Documentation for Tone class

----------------

Added


- Tone class: ``melodia.core.Tone``
- Signature class: ``melodia.core.Signature``
- Note class: ``melodia.core.Note``
- Track class: ``melodia.core.Track``
- MIDI writer: ``melodia.io.midi.MIDIWriter``