Backend package with db models (#43)

* Setup backend package with express server (#11)

* Setup backend package with express server

* Rename ts.config.json to tsconfig.json

* Update lint setup in backend package

* Add a dummy typeorm entity

* Remove dummy entity

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Co-authored-by: Prathamesh Musale <prathamesh.musale0@gmail.com>

* Setup database connection (#13)

* Setup database connection

* Refactor database initialization into separate function

* Rename index.ts to server.ts

* Use debug package for logging

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Co-authored-by: neeraj <neeraj.rtly@gmail.com>

* Create entities for ER models (#14)

* Add entity for domain

* Add entity for environment variable

* Add entity for project

* Add entity for deployment

* git ignore db directory

* Add entity for organization

* Add entity for user organization and project member

* Add foreign key user and organization to project

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Co-authored-by: neerajvijay1997 <111040298+neerajvijay1997@users.noreply.github.com>
Co-authored-by: Prathamesh Musale <prathamesh.musale0@gmail.com>
Co-authored-by: neeraj <neeraj.rtly@gmail.com>