Added icalendar gem

schedules_api/Gemfile

@@ -51,3 +51,5 @@ end
 gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
 
 gem 'rubyXL'
+
+gem 'icalendar'
\ No newline at end of file

schedules_api/Gemfile.lock

@@ -62,6 +62,7 @@ GEM
       activesupport (>= 4.2.0)
     i18n (1.0.0)
       concurrent-ruby (~> 1.0)
+    icalendar (2.4.1)
     jbuilder (2.7.0)
       activesupport (>= 4.2.0)
       multi_json (>= 1.2)
@@ -173,6 +174,7 @@ PLATFORMS
 DEPENDENCIES
   byebug
   capybara (~> 2.13)
+  icalendar
   jbuilder (~> 2.5)
   listen (>= 3.0.5, < 3.2)
   puma (~> 3.7)