Added ability to install modules and skins at run-time directly from Nuget

Oqtane.Client/Startup.cs

@@ -52,6 +52,7 @@ namespace Oqtane.Client
             services.AddScoped<IUserRoleService, UserRoleService>();
             services.AddScoped<ISettingService, SettingService>();
             services.AddScoped<IFileService, FileService>();
+            services.AddScoped<IPackageService, PackageService>();
 
             // dynamically register module contexts and repository services
             Assembly[] assemblies = AppDomain.CurrentDomain.GetAssemblies();