The great refactor (#82)

source/plugins/languages/README.md

@@ -0,0 +1,29 @@
+### 🈷️ Most used languages <sup>🚧 <code>plugin_languages_colors</code> on <code>@master</code></sup>
+
+The *languages* plugin displays which programming languages you use the most across all your repositories.
+
+<table>
+  <td align="center">
+    <img src="https://github.com/lowlighter/lowlighter/blob/master/metrics.plugin.languages.svg">
+    <img width="900" height="1" alt="">
+  </td>
+</table>
+
+It is possible to use custom colors for languages instead of those provided by GitHub by using `plugin_languages_colors` option.
+You can specify either an index with a color, or a language name (case insensitive) with a color.
+Colors can be either in hexadecimal format or a [named color](https://developer.mozilla.org/en-US/docs/Web/CSS/color_value).
+It is also possible to use a predefined set of colors from [colorsets.json](colorsets.json)
+
+#### ℹ️ Examples workflows
+
+[➡️ Available options for this plugin](metadata.yml)
+
+```yaml
+- uses: lowlighter/metrics@latest
+  with:
+    # ... other options
+    plugin_languages: yes
+    plugin_languages_ignored: html, css                          # List of languages to ignore
+    plugin_languages_skipped: my-test-repo                       # List of repositories to skip
+    plugin_languages_colors: "0:orange, javascript:#ff0000, ..." # Make most used languages orange and JavaScript red
+```