Add cmd-n and cmd-o to the default keymap

assets/keymaps/default.json

@@ -19,7 +19,9 @@
             "cmd-=": "zed::IncreaseBufferFontSize",
             "cmd--": "zed::DecreaseBufferFontSize",
             "cmd-,": "zed::OpenSettings",
-            "cmd-q": "zed::Quit"
+            "cmd-q": "zed::Quit",
+            "cmd-n": "workspace::OpenNew",
+            "cmd-o": "workspace::Open"
         }
     },
     {