Temporarily added MudBlazor.Markdown to the solution

This is necessary due to issue https://github.com/MyNihongo/MudBlazor.Markdown/issues/247

I created a PR as well: https://github.com/MyNihongo/MudBlazor.Markdown/pull/246

MudBlazor.Markdown/Services/Interfaces/IMudMarkdownClipboardService.cs

@@ -0,0 +1,6 @@
+namespace MudBlazor;
+
+public interface IMudMarkdownClipboardService
+{
+	ValueTask CopyToClipboardAsync(string text);
+}

MudBlazor.Markdown/Services/Interfaces/IMudMarkdownThemeService.cs

@@ -0,0 +1,8 @@
+namespace MudBlazor;
+
+public interface IMudMarkdownThemeService
+{
+	event EventHandler<CodeBlockTheme> CodeBlockThemeChanged;
+
+	void SetCodeBlockTheme(CodeBlockTheme theme);
+}

MudBlazor.Markdown/Services/MudMarkdownThemeService.cs

@@ -0,0 +1,9 @@
+namespace MudBlazor;
+
+internal sealed class MudMarkdownThemeService : IMudMarkdownThemeService
+{
+	public event EventHandler<CodeBlockTheme>? CodeBlockThemeChanged;
+
+	public void SetCodeBlockTheme(CodeBlockTheme theme) =>
+		CodeBlockThemeChanged?.Invoke(this, theme);
+}

MudBlazor.Markdown/Services/Registration/ServiceCollectionEx.cs

@@ -0,0 +1,15 @@
+namespace MudBlazor;
+
+public static class ServiceCollectionEx
+{
+	public static IServiceCollection AddMudMarkdownServices(this IServiceCollection @this)
+	{
+		return @this.AddScoped<IMudMarkdownThemeService, MudMarkdownThemeService>();
+	}
+
+	public static IServiceCollection AddMudMarkdownClipboardService<T>(this IServiceCollection @this)
+		where T : class, IMudMarkdownClipboardService
+	{
+		return @this.AddScoped<IMudMarkdownClipboardService, T>();
+	}
+}