support: Add English version

_includes/navbar-content.en.html

@@ -36,6 +36,7 @@
     </li>
     <li><a href="/community/">Community</a></li>
     <li><a href="/users/">Users</a></li>
+    <li><a href="/support/">Support</a></li>
   </ul>
   <ul class="nav navbar-nav navbar-right">
     <li><a href="/ja/{{ relative_path }}">日本語</a></li>

support/index.md

@@ -0,0 +1,18 @@
+---
+title: Support
+---
+
+# Support
+
+If you need support for PGroonga besides [community](../community/), please check the companies listed below that provide PGroonga Technical Support (in alphabetical order).
+
+## ClearCode Inc.
+
+[![ClearCode logo](/images/support/ClearCode.svg)](https://www.clear-code.com/)
+ClearCode has participated in Groonga development since 2008. Based on that community work and development experience, the company offers technical support services for systems structured with [Groonga](https://groonga.org/), PGroonga, and [Mroonga](https://mroonga.org/).
+
+ClearCode has strengths in making improvement proposals to extend Groonga's features and developing new features to support system improvement.
+
+For further information, please check the [service introduction page](https://www.clear-code.com/services/groonga.html). The page is in Japanese, please use your browser translation or similar services. You can contact in either English or Japanese.
+
+ - ["ClearCode logo"](https://github.com/clear-code/resources) by [ClearCode Inc.](https://www.clear-code.com), used under [CC BY-SA](https://creativecommons.org/licenses/by-sa/4.0/).