Add `get_project_data()` to get project data from project 'id'

[statnmap]

https://github.com/toggl/toggl_api_docs/blob/master/chapters/projects.md#get-project-data

GET https://api.track.toggl.com/api/v8/projects/{project_id}

with successful response:

{
    "data": {
        "id":193838628,
        "wid":777,
        "cid":123397,
        "name":"An awesome project",
        "billable":false,
        "is_private":true,
        "active":true,
        "at":"2013-03-06T12:15:37+00:00",
        "template":true,
        "color": "5"
    }
}