Added VSCode snippets and function to install them

[FishFenly]

Pull Request [Added VSCode snippets]

I've added 3 VSCode snippets using the examples in the master repository.
I've also created a function and corresponding pester test to install the snippets

Please tell us , the type of Change you are submiting:

Select one of the following:

[ ] Bug
[ x ] Feature
[ ] Minor Change

Does it fix an existing issue? Please tell us which one

Resolves #45

Results of your tests (If applicable)

[Stephanevg]

Thank you so much for your PR @FishFenly ! This is such a cool one!

Even tough the tests where failing, I am still merging it in dev,as I think this is really a nice feature to have.

The tests were actually testing if the snippets were present, instead, of testing the cmdlet in creating the snippets in the first place.

this is not a big deal, and I will correct this my self. I simply wanted to have this one merged quickly.

Thanks again ! 👍 👍