feat: add tests

.gitignore

.gitlab-ci.yml

README.md

environment.yml

requirements.txt

requirements_dev.txt

setup.py

tests/__init__.py

tests/input_files/expression.csv

tests/inputs/expression.csv

tests/inputs/test.gtf

tests/test_functions.py

tests/test_match_reptrans_explvl.py

transcript_sampler/cli.py

transcript_sampler/find_reptrans.py

transcript_sampler/images/.gitkeep

...ript_sampler/images/screenshot_git_tutorial_1_hGillet.png

...ript_sampler/images/screenshot_git_tutorial_2_hGillet.png

...t_sampler/images/screenshot_markdown_tutorial_hGillet.png

transcript_sampler/match_reptrans_explvl.py