Add GUI skeleton.

DiscImageChef.Gui/DiscImageChef.Gui.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+	
+  <PropertyGroup>
+    <TargetFramework>netstandard1.6</TargetFramework>
+    <RootNamespace>DiscImageChef.Gui</RootNamespace>
+    <PackageVersion>1.0</PackageVersion>
+    <Title>DiscImageChef.Gui</Title>
+    <Copyright>Copyright © 2018</Copyright>
+    <Description>Description of DiscImageChef.Gui</Description>
+  </PropertyGroup>
+  
+  <ItemGroup>
+    <PackageReference Include="Eto.Forms" Version="2.4.1" />
+    <PackageReference Include="Eto.Serialization.Xaml" Version="2.4.1" />
+  </ItemGroup>
+  
+</Project>

DiscImageChef.Gui/MainForm.xeto

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+<?xml version="1.0" encoding="UTF-8"?>
+<Form
+	xmlns="http://schema.picoe.ca/eto.forms" 
+	xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+	Title="My Eto Form"
+	ClientSize="400, 350"
+	Padding="10"
+	>
+	<StackLayout>
+		<Label>Some Content</Label>
+	</StackLayout>
+
+	<Form.Menu>
+		<MenuBar>
+			<ButtonMenuItem Text="F&amp;ile">
+				<ButtonMenuItem Text="Click Me!" Click="HandleClickMe" />
+			</ButtonMenuItem>
+			<MenuBar.ApplicationItems>
+				<ButtonMenuItem Text="Preferences.." Shortcut="{On Control+O, Mac=Application+Comma}" />
+			</MenuBar.ApplicationItems>
+			<MenuBar.QuitItem>
+				<ButtonMenuItem Text="Quit" Shortcut="CommonModifier+Q" Click="HandleQuit" />
+			</MenuBar.QuitItem>
+			<MenuBar.AboutItem>
+				<ButtonMenuItem Text="About..." Click="HandleAbout" />
+			</MenuBar.AboutItem>
+		</MenuBar>
+	</Form.Menu>
+	<Form.ToolBar>
+		<ToolBar>
+			<ButtonToolItem Text="Click Me!" Click="HandleClickMe" />
+		</ToolBar>
+	</Form.ToolBar>
+</Form>

DiscImageChef.Gui/MainForm.xeto.cs

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+using System;
+using System.Collections.Generic;
+using Eto.Forms;
+using Eto.Drawing;
+using Eto.Serialization.Xaml;
+
+namespace DiscImageChef.Gui
+{
+    public class MainForm : Form
+    {
+        public MainForm()
+        {
+            XamlReader.Load(this);
+        }
+
+        protected void HandleClickMe(object sender, EventArgs e)
+        {
+            MessageBox.Show("I was clicked!");
+        }
+
+        protected void HandleAbout(object sender, EventArgs e)
+        {
+            new AboutDialog().ShowDialog(this);
+        }
+
+        protected void HandleQuit(object sender, EventArgs e)
+        {
+            Application.Instance.Quit();
+        }
+    }
+}