Added Models App, Installation Batch Installation

app/models/app.rb

@@ -0,0 +1,4 @@
+class App < ActiveRecord::Base
+
+  validates :name, :package_name, presence: true
+end

app/models/batch_installation.rb

@@ -0,0 +1,3 @@
+class BatchInstallation < ActiveRecord::Base
+  belongs_to :app
+end

app/models/installation.rb

@@ -0,0 +1,9 @@
+class Installation < ActiveRecord::Base
+  enum status: [:pushed, :downloaded, :cancelled, :installed]
+
+
+
+  belongs_to :device
+  belongs_to :batch_installation
+
+end