feat: create initial TS template

[kabaros]

implements LIBS-594

[kabaros]

@d-rita to test this, I run ./app-platform/cli/bin/d2-app-scripts init test-project --typescript (replace ./app-platform with path to where you have the app-platform project). This will create a new test-project in the current directory.

For yarn start to work in the newly bootstrapped project, there are some changes to start command that need to be incorporated. Since these changes are not published yet, I use yalc to publish from /app-platform/cli

then install this version into the bootstrapped project with yalc add @dhis2/[email protected], then yarn start should work

maybe @KaiVandivier has a better workflow for testing changes to cli and init/start scripts?