Start working on those top left buttons in the UI draft.

Content.Client/UserInterface/GameHud.cs

@@ -0,0 +1,65 @@
+using System;
+using Content.Client.Utility;
+using Robust.Client.Interfaces.ResourceManagement;
+using Robust.Client.UserInterface;
+using Robust.Client.UserInterface.Controls;
+using Robust.Shared.IoC;
+using Robust.Shared.Localization;
+
+namespace Content.Client.UserInterface
+{
+    public interface IGameHud
+    {
+        Control RootControl { get; }
+
+        bool EscapeButtonDown { get; set; }
+        Action<bool> EscapeButtonToggled { get; set; }
+        void Initialize();
+    }
+
+    /// <summary>
+    ///     Responsible for laying out the default game HUD.
+    /// </summary>
+    internal sealed class GameHud : IGameHud
+    {
+        public const string StyleClassTopMenuButton = "topMenuButton";
+
+        private TextureButton _buttonEscapeMenu;
+
+#pragma warning disable 649
+        [Dependency] private readonly IResourceCache _resourceCache;
+        [Dependency] private readonly ILocalizationManager _localizationManager;
+#pragma warning restore 649
+
+        public void Initialize()
+        {
+            RootControl = new Control();
+
+            RootControl.SetAnchorPreset(Control.LayoutPreset.Wide);
+
+            _buttonEscapeMenu = new TextureButton
+            {
+                TextureNormal = _resourceCache.GetTexture("/Textures/UserInterface/hamburger.svg.96dpi.png"),
+                ToggleMode = true,
+                ToolTip = _localizationManager.GetString("Open escape menu.")
+            };
+
+            _buttonEscapeMenu.OnToggled += args => { EscapeButtonToggled?.Invoke(args.Pressed); };
+
+            _buttonEscapeMenu.AddStyleClass(StyleClassTopMenuButton);
+
+            RootControl.AddChild(_buttonEscapeMenu);
+            _buttonEscapeMenu.SetAnchorAndMarginPreset(Control.LayoutPreset.TopLeft, margin: 20);
+        }
+
+        public Control RootControl { get; private set; }
+
+        public bool EscapeButtonDown
+        {
+            get => _buttonEscapeMenu.Pressed;
+            set => _buttonEscapeMenu.Pressed = value;
+        }
+
+        public Action<bool> EscapeButtonToggled { get; set; }
+    }
+}