Let users recommend each other

[adklempner]

In a similar spirit to #144 , having recommendations from other users with a verifiable metric of how the two users interacted creates a more trustworthy system than LinkedIn where recommendations can be purchased and job history can be falsified (can you tell I hate LinkedIn? 😂 )

Let's say Alice recommends Bob as a great Javascript developer. Along with Alice's personal annotation, the recommendation shows Javascript repositories where both Alice and Bob are active contributors, determined by a metric similar to the existing one used for profiles. A reader could quickly evaluate the evaluation, and even take some time to evaluate the evaluator, following this tree as far as their heart desires.

Recommendations can be as general ("Alice has excellent writing skills, check out the README.md's she wrote for our repositories") or specific ("Alice is great at using TypeScript to quickly build React frontends with GraphQL APIs") as one desires, but the metric displayed would change accordingly.