Add code of conduct to Community page

content/community.html

@@ -46,7 +46,13 @@ title: Community
     </p>
     <a href="https://cncf.io/"><img class="orig-size" src="/assets/cncf_logo.png"></a>
 
-    <h1>Commercial support</h1>
+    <h1>Code of Conduct</h1>
+    <p>
+      To make Prometheus a welcoming and harassment-free experience for everyone, we follow the
+      <a href="https://github.com/cncf/foundation/blob/master/code-of-conduct.md">CNCF Code of Conduct</a>.
+    </p>
+  
+    <h1>Commercial Support</h1>
     <p>
       This is a list of third-party companies and individuals who provide support or
       consulting services for Prometheus. Prometheus is an independent open source