diff --git a/sideci.yml b/sideci.yml
new file mode 100644
index 0000000..305fc15
--- /dev/null
+++ b/sideci.yml
@@ -0,0 +1,8 @@
+linter:
+  rubocop:
+    root_dir: 'sideci_demo'
+
+  phpmd:
+    root_dir: 'sideci_demo'
+    options:
+      rule: 'phpmd.xml'
diff --git a/sideci_demo/.rubocop.yml b/sideci_demo/.rubocop.yml
new file mode 100644
index 0000000..2bc4a7e
--- /dev/null
+++ b/sideci_demo/.rubocop.yml
@@ -0,0 +1,2 @@
+AllCops:
+  TargetRubyVersion: 2.4
diff --git a/sideci_demo/Gemfile b/sideci_demo/Gemfile
new file mode 100644
index 0000000..8ba5864
--- /dev/null
+++ b/sideci_demo/Gemfile
@@ -0,0 +1,3 @@
+# frozen_string_literal: true
+
+gem 'rubocop', '0.51.0'
diff --git a/sideci_demo/Gemfile.lock b/sideci_demo/Gemfile.lock
new file mode 100644
index 0000000..b98085c
--- /dev/null
+++ b/sideci_demo/Gemfile.lock
@@ -0,0 +1,28 @@
+GEM
+  specs:
+    ast (2.3.0)
+    parallel (1.12.0)
+    parser (2.4.0.0)
+      ast (~> 2.2)
+    powerpack (0.1.1)
+    rainbow (2.2.2)
+      rake
+    rake (12.1.0)
+    rubocop (0.51.0)
+      parallel (~> 1.10)
+      parser (>= 2.3.3.1, < 3.0)
+      powerpack (~> 0.1)
+      rainbow (>= 2.2.2, < 3.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (~> 1.0, >= 1.0.1)
+    ruby-progressbar (1.9.0)
+    unicode-display_width (1.3.0)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  rubocop (= 0.51.0)
+
+BUNDLED WITH
+   1.15.4
diff --git a/sideci_demo/rubocop_demo.rb b/sideci_demo/rubocop_demo.rb
new file mode 100644
index 0000000..3f8b340
--- /dev/null
+++ b/sideci_demo/rubocop_demo.rb
@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+# GitHub Repository
+class Repository
+  attr_reader :client
+
+  def initialize(owner, name)
+    @owner = owner
+    @name = name
+    @client = Github.new
+  end
+
+  def releases
+    repository&.releases.map(&:name)
+  end
+
+  def active_branch
+    repository.branches.max { |a, b| a.updated_at <=> b.updated_at }
+  end
+
+  private
+
+  def repository
+    client.repository  full_name
+  end
+
+  def full_name
+    "#{owner}/#{name}"
+  end
+end