added PnpmPackage class for pnpm

[reedjones]

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added PnpmPackage class for pnpm

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[hyusetiawan]

I was just searching for this! excited to try this out!

[zzacharo]

Hello, thanks a lot for your contribution! Could you please add some simple tests similar to the existing ones for NPM and Yarn classes?

[reedjones]

Hello, thanks a lot for your contribution! Could you please add some simple tests similar to the existing ones for NPM and Yarn classes?

Sure, will add later today and update

[utnapischtim]

closed. merged by #18