Dna-parser

New:
*Atomic Number encoding
*Chaos Game representation
*DNA Walk
*EIIP encoding
*Fickett score
*Zcurve encoding
*Documentation with mkdocs

Updates:
*TFIDF -> improves encoding speeds
*Onehot -> revises encoding pattern to match literature
*Cross -> revises encoding pattern to match literature
*Real (formerly ordinal) -> revises encoding pattern to match literature
*CI and release workflows

- implements cross encoding!
- groups functions used by all encodings in a utils module.
- updates docs.

Release version 0.1.0 to PyPI