Dart code share

Dart code sharing project to demonstrate a Flutter client & a Dart server sharing same code through shared packages.

Tech:

* Dart
* Flutter
* Postgres DB
* Dart Frog - Server
* Stormberry - Code generation package

Issue 1 :

Description : Cannot use environment variables with powershell

Fix : Using https://github.com/NirmalAriyathilake/stormberry.git branch migrate-variables untill official pub introduce a fix.