New controls, main view

src/Library/TerminalUI/Models/Option.cs

@@ -0,0 +1,13 @@
+namespace TerminalUI.Models;
+
+public readonly ref struct Option<T>
+{
+    public readonly T Value;
+    public readonly bool IsSome;
+
+    public Option(T value, bool isSome)
+    {
+        Value = value;
+        IsSome = isSome;
+    }
+}

src/Library/TerminalUI/Models/Orientation.cs

@@ -0,0 +1,7 @@
+namespace TerminalUI.Models;
+
+public enum Orientation
+{
+    Horizontal,
+    Vertical
+}

src/Library/TerminalUI/Models/Size.cs

@@ -1,3 +1,3 @@
 namespace TerminalUI.Models;
 
-public record Size(int Width, int Height);
+public record struct Size(int Width, int Height);

src/Library/TerminalUI/Models/TextAlignment.cs

@@ -0,0 +1,8 @@
+namespace TerminalUI.Models;
+
+public enum TextAlignment
+{
+    Left,
+    Center,
+    Right
+}