add menu item to editor context menu

contentprovider-sample/README.md

@@ -11,13 +11,13 @@ It is not intended as a product quality extension.
 
 ![Print References](https://raw.githubusercontent.com/Microsoft/vscode-extension-samples/master/contentprovider-sample/preview.gif)
 
-# How it works
+# How it works, what it shows?
 
 - The extension implements and registers a [`TextDocumentContentProvider`](http://code.visualstudio.com/docs/extensionAPI/vscode-api#TextDocumentContentProvider) for a particular URI scheme.
 - The content provider uses the [`vscode.executeReferenceProvider`](http://code.visualstudio.com/docs/extensionAPI/vscode-api-commands)-API command to delegate searching for references to the language extensions, like TypeScript, vscode-go, or C#
 - The generated document initially contains a caption only and incrementally updates as each reference location is resolved.
 - The content provider uses the decoration API to highlight matches inside the generated document
-
+- Add an entry to editor context menu via `package.json`
 
 # How to run locally
 

contentprovider-sample/package.json

@@ -28,6 +28,15 @@
         "title": "Show All References"
       }
     ],
+    "menus": {
+      "editor/context": [
+        {
+          "command": "editor.printReferences",
+          "when": "editorHasReferenceProvider",
+          "group": "navigation@1.31"
+        }
+      ]
+    },
     "languages": [
       {
         "id": "locations",