Add doc to README

README.md

@@ -7,3 +7,83 @@ puppet-lint-unquoted_string-check
 [![Coverage Status](https://img.shields.io/coveralls/camptocamp/puppet-lint-unquoted_string-check.svg)](https://coveralls.io/r/camptocamp/puppet-lint-unquoted_string-check?branch=master)
 
 A puppet-lint plugin to check that selectors and case statements cases are quoted.
+
+
+## Checks
+
+### Unquoted string in case
+
+Unquoted strings in case statements are not valid with the future parser.
+
+#### What you have done
+
+```puppet
+case $::osfamily {
+  Debian: { }
+  RedHat: { }
+  default: { }
+}
+```
+
+#### What you should have done
+
+```puppet
+case $::osfamily {
+  'Debian': { }
+  'RedHat': { }
+  default: { }
+}
+```
+
+#### Disabling the check
+
+To disable this check, you can add `--no-unquoted_string_in_case-check` to your puppet-lint command line.
+
+```shell
+$ puppet-lint --no-unquoted_string_in_case-check path/to/file.pp
+```
+
+Alternatively, if you’re calling puppet-lint via the Rake task, you should insert the following line to your `Rakefile`.
+
+```ruby
+PuppetLint.configuration.send('disable_unquoted_string_in_case')
+```
+
+
+### Unquoted string in selector
+
+Unquoted strings in selector statements are not valid with the future parser.
+
+#### What you have done
+
+```puppet
+$foo = $::osfamily ? {
+  Debian => 'bar',
+  RedHat => 'baz',
+  default => 'qux',
+}
+```
+
+#### What you should have done
+
+```puppet
+$foo = $::osfamily ? {
+  'Debian' => 'bar',
+  'RedHat' => 'baz',
+  default  => 'qux',
+}
+```
+
+#### Disabling the check
+
+To disable this check, you can add `--no-unquoted_string_in_selector-check` to your puppet-lint command line.
+
+```shell
+$ puppet-lint --no-unquoted_string_in_selector-check path/to/file.pp
+```
+
+Alternatively, if you’re calling puppet-lint via the Rake task, you should insert the following line to your `Rakefile`.
+
+```ruby
+PuppetLint.configuration.send('disable_unquoted_string_in_selector')
+```