Add devcontainer development environment (#169)

* Add devcontainer

* Add test tasks for the different Redis versions. Specify default .NET solution.

* Minor clarification by moving initialization to constructor

* Update devcontainer setup, and vscode tasks, to match updated Redis versions from CI pipeline.

* Include section on DevContainers

* Include section on DevContainers

Signed-off-by: haysch <[email protected]>

* Fix "spelling mistakes"

* add explenation about dev containers

* wordlist

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Signed-off-by: haysch <[email protected]>
Co-authored-by: shacharPash <[email protected]>
Co-authored-by: shacharPash <[email protected]>

Author: haysch