Give a success message after adding a box

lib/vagrant/action/builtin/box_add.rb

@@ -30,8 +30,9 @@ module Vagrant
 
           # Add the box
           env[:ui].info I18n.t("vagrant.actions.box.add.adding", :name => env[:box_name])
+          added_box = nil
           begin
-            env[:box_collection].add(
+            added_box = env[:box_collection].add(
               @temp_path, env[:box_name], env[:box_provider], env[:box_force])
           rescue Vagrant::Errors::BoxUpgradeRequired
             # Upgrade the box
@@ -45,6 +46,10 @@ module Vagrant
           # downloaded temporary file.
           recover(env)
 
+          # Success, we added a box!
+          env[:ui].success(
+            I18n.t("vagrant.actions.box.add.added", name: added_box.name, provider: added_box.provider))
+
           # Carry on!
           @app.call(env)
         end

templates/locales/en.yml

@@ -792,6 +792,8 @@ en:
         add:
           adding: |-
             Extracting box...
+          added: |-
+            Successfully added box '%{name}' with provider '%{provider}'!
         destroy:
           destroying: "Deleting box '%{name}'..."
         download: