Add command line interface and change solution structure (#26)

DiscordChatExporter.Gui/ViewModels/IMainViewModel.cs

@@ -0,0 +1,23 @@
+using System.Collections.Generic;
+using DiscordChatExporter.Core.Models;
+using GalaSoft.MvvmLight.CommandWpf;
+
+namespace DiscordChatExporter.Gui.ViewModels
+{
+    public interface IMainViewModel
+    {
+        bool IsBusy { get; }
+        bool IsDataAvailable { get; }
+
+        string Token { get; set; }
+
+        IReadOnlyList<Guild> AvailableGuilds { get; }
+        Guild SelectedGuild { get; set; }
+        IReadOnlyList<Channel> AvailableChannels { get; }
+
+        RelayCommand PullDataCommand { get; }
+        RelayCommand ShowSettingsCommand { get; }
+        RelayCommand ShowAboutCommand { get; }
+        RelayCommand<Channel> ShowExportSetupCommand { get; }
+    }
+}