Added sample to demonstrate usage

Author: AshleighAdams

samples/HelloMenu/HelloMenu.cs

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+using System;
+
+using CounterStrikeSharp.API.Core;
+using CounterStrikeSharp.API.Core.Attributes;
+using CounterStrikeSharp.API.Core.Attributes.Registration;
+using CounterStrikeSharp.API.Modules.Commands;
+
+using CSSUniversalMenuAPI;
+
+namespace HelloMenu;
+
+[MinimumApiVersion(314)]
+public sealed class TeamDeathmatchPlugin : BasePlugin
+{
+	public override string ModuleName => "CsGals.TeamDeathmatch";
+	public override string ModuleDescription => "Team Deathmatch gamemode plugin";
+	public override string ModuleVersion => Verlite.Version.Full;
+
+
+	[ConsoleCommand("css_hello")]
+	public void HelloMenu(CCSPlayerController player, CommandInfo info)
+	{
+		var menu = UniversalMenu.CreateMenu(player);
+		menu.Title = "Hello";
+
+		var playerItem = menu.CreateItem();
+		playerItem.Title = "Player";
+		playerItem.Selected += PlayerItem_Selected;
+
+		var aboutItem = menu.CreateItem();
+		aboutItem.Title = "About";
+		aboutItem.Selected += AboutItem_Selected;
+
+		menu.Display();
+	}
+
+	private void PlayerItem_Selected(IMenuItem menuItem)
+	{
+		var player = menuItem.Menu.Player;
+		player.PrintToChat($"Hello {player.PlayerName}");
+
+		// close does not happen implicitly, you need to tell it to close
+		menuItem.Menu.Close();
+	}
+
+	private void AboutItem_Selected(IMenuItem menuItem)
+	{
+		var childMenu = UniversalMenu.CreateMenu(menuItem.Menu);
+
+		var authorItem = childMenu.CreateItem();
+		authorItem.Title = $"Author: Ashleigh Adams";
+		authorItem.Enabled = false;
+
+		var versionItem = childMenu.CreateItem();
+		versionItem.Title = $"Version: {Verlite.Version.Full}";
+		versionItem.Enabled = false;
+
+		var revItem = childMenu.CreateItem();
+		revItem.Title = $"Revision: {Verlite.Version.Commit[..8]}";
+		revItem.Enabled = false;
+
+		childMenu.Display();
+	}
+}

samples/HelloMenu/HelloMenu.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="CSSUniversalMenuApi" Version="0.4.0" ExcludeAssets="runtime" />
+  </ItemGroup>
+
+</Project>

samples/HelloMenu/README.md

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+# Menu usage sample
+
+Example menu showing usage of CSSUniversalMenuAPI
+
+![](docs/MainMenu.png)
+![](docs/ChildMenu.png)
+
+## Build instructions
+
+```sh
+dotnet publish -c Release -o artifacts/HelloMenu
+```
+