Add repositories query with user filter

[kapillamba4]

Fixes #23

[0xnmn]

Please share sample request and response.

[kapillamba4]

Sample Request

query($username: String!, $uid: String!) {
  repositories(username: $username, uid: $uid) {
    forks,
    name,
    isFork,
    owner,
    size,
    stars,
    url,
    userCommits,
    watchers
  }
}

Query Variables

{
  "username": "1",
  "uid": "MDEwOlJlcG9zaXRvcnk4MDg5MjQ4"
}

Sample Response

{
  "data": {
    "repositories": [
      {
        "forks": 0,
        "name": "discourse_docker",
        "isFork": true,
        "owner": "1",
        "languages": [
          {
            "name": "Shell",
            "color": "#89e051"
          },
          {
            "name": "Ruby",
            "color": "#701516"
          }
        ],
        "size": 52167,
        "stars": 0,
        "url": "https://github.com/1/discourse_docker",
        "userCommits": 0,
        "watchers": 1
      },
      {
        "forks": 0,
        "name": "geode",
        "isFork": false,
        "owner": "1",
        "languages": [],
        "size": 0,
        "stars": 0,
        "url": "https://github.com/1/geode",
        "userCommits": 0,
        "watchers": 1
      },
      {
        "forks": 4,
        "name": "python-youtube-library",
        "isFork": false,
        "owner": "1",
        "languages": [
          {
            "name": "Python",
            "color": "#3572A5"
          }
        ],
        "size": 12043,
        "stars": 15,
        "url": "https://github.com/1/python-youtube-library",
        "userCommits": 0,
        "watchers": 4
      },
      {
        "forks": 0,
        "name": "supplespine.com",
        "isFork": false,
        "owner": "stephenbalaban",
        "languages": [],
        "size": 0,
        "stars": 0,
        "url": "https://github.com/stephenbalaban/supplespine.com",
        "userCommits": 0,
        "watchers": 2
      },
      {
        "forks": 0,
        "name": "tradecoin",
        "isFork": false,
        "owner": "hlj381",
        "languages": [
          {
            "name": "TypeScript",
            "color": "#2b7489"
          },
          {
            "name": "C++",
            "color": "#f34b7d"
          },
          {
            "name": "C",
            "color": "#555555"
          },
          {
            "name": "Assembly",
            "color": "#6E4C13"
          },
          {
            "name": "IDL",
            "color": "#a3522f"
          },
          {
            "name": "Python",
            "color": "#3572A5"
          },
          {
            "name": "Objective-C++",
            "color": "#6866fb"
          },
          {
            "name": "Shell",
            "color": "#89e051"
          }
        ],
        "size": 6951241,
        "stars": 0,
        "url": "https://github.com/hlj381/tradecoin",
        "userCommits": 0,
        "watchers": 2
      }
    ]
  }
}

@hereisnaman this is the expected response for the sample request? All repositories for a user are sent as response for above query given username and uid