Add 'Gemfile'

Gemfile

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+source "https://rubygems.org"
+
+# Hello! This is where you manage which Jekyll version is used to run.
+# When you want to use a different version, change it below, save the
+# file and run `bundle install`. Run Jekyll with `bundle exec`, like so:
+#
+#     bundle exec jekyll serve
+#
+# This will help ensure the proper Jekyll version is running.
+# Happy Jekylling!
+
+# gem "github-pages", group: :jekyll_plugins
+
+# If you want to use Jekyll native, uncomment the line below.
+# To upgrade, run `bundle update`.
+
+gem "jekyll"
+
+gem "wdm", "~> 0.1.0" if Gem.win_platform?
+
+# If you have any plugins, put them here!
+group :jekyll_plugins do
+  # gem "jekyll-archives"
+  gem "jekyll-feed"
+  gem 'jekyll-sitemap'
+  gem 'hawkins'
+end