Update README.md

[lanery]

Description

• Update the README to more accurately reflect what the package is made for and capable of.
• Update install directions now that repo is public (can now install from the repo directly via pip install git+<repo url>.

Considered building it and releasing it, but not sure if it's ready for that? Would be cool if it were automated!

[ekiefl]

I recently wiped my conda envs and started fresh, so I had the opportunity of recreating the development environment for this repo. Everything worked as intended, except there's currently no developer installation instructions, and I think there should be.

  conda env create -n ramanalysis-dev --file envs/dev.yml
conda activate  ramanalysis-dev
poetry install --no-root --with dev,docs,build
pip install -e .
make test

Everything ran without error 👍.

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In the example I think you should assume your CWD is the repo root, making the path:

example_data_directory = Path("./ramanalysis/tests/example_data/OpenRAMAN/")