Add markdown linter locally

Author: chaserx

.mdlrc

@@ -0,0 +1 @@
+style "#{File.dirname(__FILE__)}/md_styles.rb"

Gemfile.lock

@@ -12,6 +12,9 @@ GEM
     ast (2.4.3)
     base64 (0.2.0)
     bigdecimal (3.1.9)
+    chef-utils (18.7.6)
+      concurrent-ruby
+    concurrent-ruby (1.3.5)
     crack (1.0.0)
       bigdecimal
       rexml
@@ -34,10 +37,25 @@ GEM
     json (2.10.2)
     jwt (2.10.1)
       base64
+    kramdown (2.5.1)
+      rexml (>= 3.3.9)
+    kramdown-parser-gfm (1.1.0)
+      kramdown (~> 2.0)
     language_server-protocol (3.17.0.4)
     lefthook (1.11.12)
     lint_roller (1.1.0)
     logger (1.7.0)
+    mdl (0.13.0)
+      kramdown (~> 2.3)
+      kramdown-parser-gfm (~> 1.1)
+      mixlib-cli (~> 2.1, >= 2.1.1)
+      mixlib-config (>= 2.2.1, < 4)
+      mixlib-shellout
+    mixlib-cli (2.1.8)
+    mixlib-config (3.0.27)
+      tomlrb
+    mixlib-shellout (3.3.9)
+      chef-utils
     multi_xml (0.7.2)
       bigdecimal (~> 3.1)
     net-http (0.6.0)
@@ -149,6 +167,7 @@ GEM
       lint_roller (~> 1.1)
       rubocop-performance (~> 1.25.0)
     stringio (3.1.6)
+    tomlrb (2.0.3)
     unicode-display_width (3.1.4)
       unicode-emoji (~> 4.0, >= 4.0.4)
     unicode-emoji (4.0.4)
@@ -166,6 +185,7 @@ PLATFORMS
 DEPENDENCIES
   irb
   lefthook
+  mdl
   omniauth-github-data-residency!
   rack-test
   rake (~> 13.0)

md_styles.rb

@@ -0,0 +1 @@
+exclude_rule "MD013" # Line length

omniauth-github-data-residency.gemspec

@@ -45,6 +45,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "irb"
   spec.add_development_dependency "rake", "~> 13.0"
   spec.add_development_dependency "lefthook"
+  spec.add_development_dependency "mdl"
 
   # For more information and examples about making a new gem, check out our
   # guide at: https://bundler.io/guides/creating_gem.html