Made small changes to make the README and CONTRIBUTING files easier to follow (#4993)

* Made small changes in punctuation, word selection, and word order to make it easier to read and understand the README and CONTRIBUTING 'md' files.

* Made changes based on feedback from @daniel-beck.

* Update README.md

Co-authored-by: Daniel Beck <1831569+daniel-beck@users.noreply.github.com>

* Update CONTRIBUTING.md

Co-authored-by: Mark Waite <mark.earl.waite@gmail.com>

* Apply suggestions from code review

Co-authored-by: Burk Hufnagel <304328+BurkHufnagel@example.com>
Co-authored-by: Oleg Nenashev <o.v.nenashev@gmail.com>
Co-authored-by: Daniel Beck <1831569+daniel-beck@users.noreply.github.com>
Co-authored-by: Mark Waite <mark.earl.waite@gmail.com>