Add first draft of description, examples, and API details

Author: schuylergleaves

specs/BrowserTaskManager.md

@@ -3,28 +3,67 @@ The WebView2 team has been asked to provide an API to expose the Browser Task
 Manager. At the current time, it is expected that the user will close the Task 
 Manager manually, so we do not need to provide an API to close it.
 
+In this document we describe the updated API. We'd appreciate your feedback.
+
 # Description
-TBD
+We propose extending `CoreWebView2` to provide a `ShowTaskManager` method.
+This method will open a new window containing the task manager. If the task 
+manager is already opened, this method will do nothing.
 
 # Examples
-## C++: TBD
+## C++: Show Task Manager
 
 ``` cpp
-TBD
+wil::com_ptr<ICoreWebView2_5> m_webview;
+
+// This method could be called from a menu, such as 
+// [Script -> Show Task Manager]. 
+void ScriptComponent::ShowTaskManager()
+{
+    CHECK_FAILURE(m_webview->ShowTaskManager())
+}
+
+
 ```
 
-## C#: TBD
+## C#: Show Task Manager
 ```c#
-TBD
+private WebView2 m_webview;
+
+// This method could be called from a menu, such as 
+// [Script -> Show Task Manager]. 
+void ShowTaskManager()
+{
+    m_webview.CoreWebView2.ShowTaskManager();
+}
 ```
 
 # API Details
 ## C++
 ```
-TBD
+/// This is a continuation of the `ICoreWebView2_4` interface
+[uuid(20d02d59-6df2-42dc-bd06-f98a694b1302), object, pointer_default(unique)]
+interface ICoreWebView2_5 : ICoreWebView2_4 {
+    /// Shows the Browser Task Manager view as a new window. Does nothing
+    /// if run when the Browser Task Manager is already open.
+    HRESULT ShowTaskManager();
+}
 ```
 
 ## C#
 ```c#
-TBD
+namespace Microsoft.Web.WebView2.Core
+{
+    runtimeclass CoreWebView2
+    {
+        // There are many methods and properties of ICoreWebView2_* which I am
+        // not including here for simplicity. 
+
+        [interface_name("Microsoft.Web.WebView2.Core.ICoreWebView2_5")]
+        {
+            // ICoreWebView2_5 members
+            void ShowTaskManager();
+        }
+    }
+}
 ```