add github-actions

[theavege]

Hello!

I add github-actions with tests and dependabot for github-actions. I hope it is useful.

Thanks.

[GuvaCode]

Если честно, то я вообще не понимаю зачем это нужно?

[theavege]

@GuvaCode , You don't understand what CI is for?
Or you don't understand why CI is needed in your project?

[GuvaCode]

Why do we need it in the project ?

[theavege]

Why do we need it in the project ?

@GuvaCode Now these scenarios show that the programs can be built.
If you wish, I can add launching unit tests.