Added links to documentation from the menu.

Menu links to per-component and project documentation.

Bug: 132072231
Change-Id: Id47da9e8e8d85955fb95535a2de28ea2830be0cf

Author: Stewart Miles

source/IOSResolver/src/IOSResolver.cs

@@ -703,6 +703,14 @@ exception is TypeInitializationException ||
         }
     }
 
+    /// <summary>
+    /// Link to the documentation.
+    /// </summary>
+    [MenuItem("Assets/Play Services Resolver/iOS Resolver/Documentation")]
+    public static void OpenDocumentation() {
+        Application.OpenURL(VersionHandlerImpl.DocumentationUrl("#ios-resolver-usage"));
+    }
+
     // Display the iOS resolver settings menu.
     [MenuItem("Assets/Play Services Resolver/iOS Resolver/Settings")]
     public static void SettingsDialog() {

source/PlayServicesResolver/src/PlayServicesResolver.cs

@@ -1553,6 +1553,14 @@ private static void NotAvailableDialog() {
 
         }
 
+        /// <summary>
+        /// Link to the documentation.
+        /// </summary>
+        [MenuItem("Assets/Play Services Resolver/Android Resolver/Documentation")]
+        public static void OpenDocumentation() {
+            Application.OpenURL(VersionHandlerImpl.DocumentationUrl("#android-resolver-usage"));
+        }
+
         /// <summary>
         /// Add a menu item for resolving the jars manually.
         /// </summary>

source/VersionHandlerImpl/src/VersionHandlerImpl.cs

@@ -1693,6 +1693,32 @@ internal static void Log(string message, bool verbose = false,
         logger.Log(message, level: verbose ? LogLevel.Verbose : level);
     }
 
+    /// <summary>
+    /// Generate a documentation URL.
+    /// </summary>
+    /// <param name="subsection">String to add to the URL.</param>
+    /// <returns>URL</returns>
+    internal static string DocumentationUrl(string subsection) {
+        return String.Format("{0}{1}", "https://github.com/googlesamples/unity-jar-resolver",
+                             subsection);
+    }
+
+    /// <summary>
+    /// Link to the project documentation.
+    /// </summary>
+    [MenuItem("Assets/Play Services Resolver/Documentation")]
+    public static void OpenProjectDocumentation() {
+        Application.OpenURL(VersionHandlerImpl.DocumentationUrl("#overview"));
+    }
+
+    /// <summary>
+    /// Link to the documentation.
+    /// </summary>
+    [MenuItem("Assets/Play Services Resolver/Version Handler/Documentation")]
+    public static void OpenDocumentation() {
+        Application.OpenURL(VersionHandlerImpl.DocumentationUrl("#version-handler-usage"));
+    }
+
     /// <summary>
     /// Add the settings dialog for this module to the menu and show the
     /// window when the menu item is selected.