Add GitHub community support plugin (#231)

source/plugins/support/README.md

@@ -0,0 +1,23 @@
+### 🗨️ GitHub Community Support
+
+The *support* plugin lets you display your statistics from [GitHub Support Community](https://github.community/).
+
+<table>
+  <td align="center">
+    <img src="https://github.com/lowlighter/lowlighter/blob/master/metrics.plugin.support.svg">
+    <img width="900" height="1" alt="">
+  </td>
+</table>
+
+An account on [GitHub Support Community](https://github.community/) is required to use this plugin.
+
+#### ℹ️ Examples workflows
+
+[➡️ Available options for this plugin](metadata.yml)
+
+```yaml
+- uses: lowlighter/metrics@latest
+  with:
+    # ... other options
+    plugin_support: yes
+```