Add new garden button on modal planting form

app/views/plantings/_modal.html.haml

@@ -20,6 +20,7 @@
                     %p= garden.description
                   %span
                     - garden
+        = link_to 'add new garden', new_garden_path
 
 
 %a.btn{"data-target" => "#modelPlantingForm", "data-toggle" => "modal", href: "", id: 'planting-button'}