To do: digging more about a user

[coco-lab-2022]

One thing we need to do now is to get some more information about the subjects.
Ideally, we would like to know:

1. a developer's no. of followers.
2. how long a developer has been a GitHub users.
3. how many public repos a developer has.
4. if a developer discloses the following stuff:
   "company": "GitHub",
   "blog": "https://github.com/blog",
   "location": "San Francisco",
   "email": "octocat@github.com",
   "hireable": false,
   "bio": "There once was...",
   "twitter_username": "monatheoctocat",
5. if a developer is a core developer in a project (we may determine this with the centrality measure).

1-4 are fairly easy to obtain by querying user API: https://docs.github.com/en/rest/users/users#get-a-user
5 requires something we may borrow from Yue Yang.

So, we may borrow @jiangzheng77 some efforts and time to get 1-4 done in the following weeks. And I will ask Yue to offer some help to deal with 5 later.

Any thoughts?