CHORE: Add documentation to the Contributor model (#96)

Basic-Car-Maintenance/Shared/Models/Contributor.swift

@@ -7,16 +7,44 @@
 
 import Foundation
 
+/// A model representing a contributor.
+///  
+/// Contributors are people who have supported this project in any manner.
+///  
+/// - Note: In this project, we don't actually create this ``Contributor`` 
+/// anywhere, we are getting all the contributors from [GitHub's Repository Statistics
+/// API](https://api.github.com/repos/mikaelacaron/Basic-Car-Maintenance/contributors)
+///
+/// On status code of 200, we decode the response into ``SettingsViewModel/contributors``
+/// array of ``Contributor`` type and display them in ``ContributorsListView``.
 struct Contributor: Codable, Hashable, Identifiable {
+
+    /// The handle for the GitHub user account
     let login: String
+
+    /// The unique identifier for an account
     let id: Int
+
+    /// The ID used to move between the REST API and the GraphQL API
     let nodeID: String
+
+    /// The link to profile image of the user
     let avatarURL: String
+
+    /// The link to user's avatar on Gravatar if they haven't uploaded an avatar directly.
+    /// - Warning: Deprecated by GitHub in 2014
     let gravatarID: String
+
+    /// The endpoint for a user's profile data
     let url: String
+
+    /// The url to this account on GitHub
     let htmlURL: String
+
+    /// The number of Pull Requests successfully merged
     let contributions: Int
-
+
+    /// Keys to be used for encoding and decoding.
     enum CodingKeys: String, CodingKey {
         case login, id
         case nodeID = "nodeId"