Please support projen constructs

[mbonig]

I'd love to see projen constructs supported in the service.

[Chriscbr]

@mbonig Right now we're holding off on listing projen as another CDK framework because it's still in a very early, experimental state.

But, I'll cue you in on a trick 😉 - currently if your projen library is compiled with jsii and has "cdk" as a keyword on npm (added through your package.json), Construct Hub will index it. So, in this way it's possible for projen libraries to be listed, as seen here or here.

[mrgrain]

Tracked here: cdklabs/construct-hub#996