Add markdownlint style

.mdl_style.rb

@@ -0,0 +1,20 @@
+# mdl rules https://github.com/markdownlint/markdownlint/blob/master/docs/RULES.md
+
+# Import all default rules
+all
+
+# Only allow atx style headings (e.g. # H1 ## H2)
+rule 'MD003', :style => :atx
+
+# Only allow dashes in unordered lists
+rule 'MD004', :style => :dash
+
+# Enforce line length of 80 characters except in code blocks and tables
+rule 'MD013', :code_blocks => false, :tables => false
+
+# Ignore blockquotes separated only be a blank line. This is a limitation of
+# some markdown parsers, not markdown itself.
+exclude_rule 'MD028'
+
+# Allow bare URLs (i.e. without angle brackets)
+exclude_rule 'MD034'