Run: initial implementation of Run app

Userland/Applications/Run/Run.gml

@@ -0,0 +1,65 @@
+@GUI::Widget {
+    fill_with_background_color: true
+
+    layout: @GUI::VerticalBoxLayout {
+        margins: [10, 10, 10, 10]
+    }
+
+    @GUI::Widget {
+        layout: @GUI::HorizontalBoxLayout {
+            spacing: 10
+        }
+
+        @GUI::ImageWidget {
+            name: "icon"
+        }
+
+        @GUI::Label {
+            name: "info"
+            text: "Type the name of a program, folder, document,\\nor website, and SerenityOS will open it for you."
+            text_alignment: "CenterLeft"
+        }
+    }
+
+    @GUI::Widget {
+        layout: @GUI::HorizontalBoxLayout {
+        }
+
+        @GUI::Label {
+            text: "Open:"
+            fixed_width: 50
+            text_alignment: "CenterLeft"
+        }
+
+        @GUI::TextBox {
+            name: "path"
+        }
+    }
+
+    @GUI::Widget {
+        layout: @GUI::HorizontalBoxLayout {
+        }
+
+        // HACK: using an empty widget as a spacer
+        @GUI::Widget {
+        }
+
+        @GUI::Button {
+            name: "ok_button"
+            text: "OK"
+            fixed_width: 75
+        }
+
+        @GUI::Button {
+            name: "cancel_button"
+            text: "Cancel"
+            fixed_width: 75
+        }
+
+        @GUI::Button {
+            name: "browse_button"
+            text: "Browse..."
+            fixed_width: 75
+        }
+    }
+}