Remove dependency on fluent assertions and fix folder paths

TerminalGuiFluentTesting/With.cs

@@ -0,0 +1,22 @@
+using Terminal.Gui;
+
+namespace TerminalGuiFluentTesting;
+
+/// <summary>
+///     Entry point to fluent assertions.
+/// </summary>
+public static class With
+{
+    /// <summary>
+    ///     Entrypoint to fluent assertions
+    /// </summary>
+    /// <param name="width"></param>
+    /// <param name="height"></param>
+    /// <returns></returns>
+    public static GuiTestContext<T> A<T> (int width, int height) where T : Toplevel, new () { return new (width, height); }
+
+    /// <summary>
+    ///     The global timeout to allow for any given application to run for before shutting down.
+    /// </summary>
+    public static TimeSpan Timeout { get; set; } = TimeSpan.FromSeconds (30);
+}