Added package for unit testing

The first public version of the fcf-framework-unitest package has been released. Which provides functionality for performing unit testing, both on the NODEJS server side and on the browser side, and allows you to run browser tests from the command line, which makes it easier to build a project testing infrastructure.

Package description page: https://fcf-framework.tech/packages/fcf-framework-unitest

Package download page: https://fcf-framework.tech/download/fcf-framework-unitest