Implement AssigneesClient

Implement client to list and check available assignees for a repository

Octokit.Reactive/IAssigneesClient.cs

@@ -0,0 +1,24 @@
+using System.Threading.Tasks;
+
+namespace Octokit
+{
+    public interface IAssigneesClient
+    {
+        /// <summary>
+        /// Gets all the available assignees (owner + collaborators) to which issues may be assigned.
+        /// </summary>
+        /// <param name="owner">The owner of the repository</param>
+        /// <param name="name">The name of the repository</param>
+        /// <returns></returns>
+        Task<IReadOnlyList<User>> GetForRepository(string owner, string name);
+
+        /// <summary>
+        /// Checks to see if a user is an assignee for a repository.
+        /// </summary>
+        /// <param name="owner">The owner of the repository</param>
+        /// <param name="name">The name of the repository</param>
+        /// <param name="assignee">Username of the prospective assignee</param>
+        /// <returns></returns>
+        Task<bool> CheckAssignee(string owner, string name, string assignee);
+    }
+}

Octokit.Reactive/Octokit.Reactive.csproj

@@ -93,6 +93,7 @@
     <Compile Include="Clients\ObservableRepositoriesClient.cs" />
     <Compile Include="Clients\ObservableSshKeysClient.cs" />
     <Compile Include="Clients\ObservableUsersClient.cs" />
+    <Compile Include="IAssigneesClient.cs" />
     <Compile Include="IObservableNotificationsClient.cs" />
     <Compile Include="Helpers\AuthorizationExtensions.cs" />
     <Compile Include="Helpers\ConnectionExtensions.cs" />