General changes related to making repo public (#27)

* Update README.md

* added version specification to requirements.txt

* Create CONTRIBUTING.md

* Create LICENSE

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Update CONTRIBUTING.md

* Update CONTRIBUTING.md

* updated user guide

* added cc-by-sa license text

* Update CONTRIBUTING.md

Co-authored-by: Ryan Bloom <Ryan.b.702@gmail.com>

* changed version specification to ~= for everything except pyserial

* updated pyproject.toml with new version specification

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Co-authored-by: Ryan Bloom <Ryan.b.702@gmail.com>