Chore/update readme (#1) (#2) (#3)

* update: README.md

* update: README.md

* update: README.md

* update: README.md

* update: added env vars docs

* update: added routers docs

* update: added handlers docs

* update: make command for docker

* update: README.md

* update: README.md

* update: added a post handler

* update: cleanup

* update: README.md

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Co-authored-by: JocelynPinto <162846923+JocelynPinto@users.noreply.github.com>