Add back menu and shortcut for the launcher (#55)

* Add back menu and shortcut for the launcher

* Bump version to 0.5.1

Author: krassowski

package.json

@@ -1,6 +1,6 @@
 {
     "name": "jupyterlab-new-launcher",
-    "version": "0.5.0",
+    "version": "0.5.1",
     "description": "A redesigned JupyterLab launcher",
     "keywords": [
         "jupyter",

schema/plugin.json

@@ -1,5 +1,4 @@
 {
-  "jupyter.lab.shortcuts": [],
   "jupyter.lab.setting-icon": "ui-components:launcher",
   "jupyter.lab.setting-icon-label": "New Launcher",
   "jupyter.lab.toolbars": {
@@ -11,6 +10,26 @@
       }
     ]
   },
+  "jupyter.lab.menus": {
+    "main": [
+      {
+        "id": "jp-mainmenu-file",
+        "items": [
+          {
+            "command": "launcher:create",
+            "rank": 0.99
+          }
+        ]
+      }
+    ]
+  },
+  "jupyter.lab.shortcuts": [
+    {
+      "command": "launcher:create",
+      "keys": ["Accel Shift L"],
+      "selector": "body"
+    }
+  ],
   "title": "New Launcher",
   "description": "jupyterlab-new-launcher settings.",
   "type": "object",