[chore] Clean up repo tooling

[bradtaniguchi]

I found a few things we can improve on the tooling/development side if we are to put this repo into a more "maintenance" mode moving forward.

• [x] Add .nvmrc and update docs to specify which version of nodejs we should develop on and are tested against.
• [ ] Add github-action pipeline to run some sanity checks against the repo
• [x] Update package.json with rimraf rather than windows specific rimdir, will allow for linux based development, even though this library generally is used on windows.
• [x] Add clean and build commands for developer accessibility
• [ ] Add contributing docs
• [ ] #77
• [ ] Add .vscode specific files, primarily for extensions we should install (gitpod might already have some)

[bradtaniguchi]

TO support github-action checks, we might be able to leverage: https://github.com/marketplace/actions/mssql-suite

this should allow us to install and setup a test-suite environment during a github-action pipeline without much work.