Implimented the password part and authentication with Plex

PlexRequests.Api/PlexApi.cs

@@ -41,7 +41,7 @@ namespace PlexRequests.Api
         }
         private static string Version { get; set; }
 
-        public PlexAuthentication GetToken(string username, string password)
+        public PlexAuthentication SignIn(string username, string password)
         {
             var userModel = new PlexUserRequest
             {

PlexRequests.UI/Modules/AdminModule.cs

@@ -127,7 +127,7 @@ namespace PlexRequests.UI.Modules
             }
 
             var plex = new PlexApi();
-            var model = plex.GetToken(user.username, user.password);
+            var model = plex.SignIn(user.username, user.password);
 
             if (model.user == null)
             {

PlexRequests.UI/Modules/UserLoginModule.cs

@@ -30,6 +30,7 @@ using Nancy;
 using Nancy.Responses.Negotiation;
 
 using PlexRequests.Api;
+using PlexRequests.Api.Models;
 using PlexRequests.Core;
 using PlexRequests.Core.SettingModels;
 using PlexRequests.UI.Models;
@@ -72,6 +73,15 @@ namespace PlexRequests.UI.Modules
             if (settings.UserAuthentication && settings.UsePassword) // Authenticate with Plex
             {
 
+                var signedIn = (PlexAuthentication)api.SignIn(username, password);
+                if (signedIn.user?.authentication_token != null)
+                {
+                    var users = api.GetUsers(settings.PlexAuthToken);
+                    if (users.User.Any(x => x.Username == username))
+                    {
+                        authenticated = true;
+                    }
+                }
             }
             else if(settings.UserAuthentication) // Check against the users in Plex
             {