Add support for windows runner

[szzsolt]

This PR adds support for running the action on windows runners. It includes:

• powershell script to install op, following the same logic as the original shell script
• powershell test script modelled after the original bash version
• changes to the .yml files to run the powershell script when running on windows
• updated README

[edif2008]

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[edif2008]

This is really exciting to see! Thank you so much for contributing with this enhancement! 💪🏻

[Jongveloper]

@edif2008 @szzsolt I need to run actions on the window as soon as possible. So, can I copy the contents of the PR and sign the commitment to post the PR?😢😢

[Natiq0]

+1

@szzsolt Any chance you will sign your commits?

@Jongveloper Did you manage to find a workaround? Did you re-post the PR with signed commits?