Add new meta files and interfaces for project structure

Assets/Samples/A_ Pathfinding Project/5.3.8/Example scenes/ExampleScripts/DocumentationButton.cs

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+using UnityEngine;
+
+namespace Pathfinding.Examples {
+	[ExecuteInEditMode]
+	[HelpURL("https://arongranberg.com/astar/documentation/stable/documentationbutton.html")]
+	public class DocumentationButton : MonoBehaviour {
+		public string page;
+
+		const string UrlBase = "https://arongranberg.com/astar/docs/";
+
+		GUIContent buttonContent = new GUIContent("Example Scene Documentation");
+
+		void Awake () {
+			useGUILayout = false;
+		}
+
+#if UNITY_EDITOR
+		void OnGUI () {
+			if (GUI.Button(new Rect(Screen.width - 250, Screen.height - 60, 240, 50), buttonContent)) {
+				Application.OpenURL(UrlBase + page + ".html");
+			}
+		}
+#endif
+	}
+}