Develop (#19)

* add app registration manifest and piazza icon

* install instructions

* readme formatting and clarity

* add missing install instructions

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* Update README.md

* temp contributing.md

* update contributing and add venv to gitignore

* bugfix: threaded message replies

* install script

* update readme

* update readme

* remove git conflict

* update instructions to include install script

* Feature reply in thread (#16)

* Update issue templates

* Delete CONTRIBUTING.md

moving to .github

* Revert "Update issue templates"

This reverts commit 43cd34f.

* Revert "Delete CONTRIBUTING.md"

This reverts commit 25384ed.

* Update issue templates

* Create pull_request_template.md

* Create pull_request_template.md

* Update README.md

* Update README.md

* Update issue templates

* Update feature_request.md

* broadcast replies to unthreaded messages

* delte test file