add reference to cncf (#15408)

README.md

@@ -13,6 +13,13 @@
   <a href="https://codeclimate.com/github/netdata/netdata"><img src="https://codeclimate.com/github/netdata/netdata/badges/gpa.svg" alt="Code Climate"></a>
   <a href="https://www.gnu.org/licenses/gpl-3.0"><img src="https://img.shields.io/badge/License-GPL%20v3%2B-blue.svg" alt="License: GPL v3+"></a>
 </p>
+<hr class="solid">
+
+<p align="center">
+  Netdata is a member of the Cloud Native Computing Foundation (CNCF), and it is the 3rd most starred project in the <a href="https://landscape.cncf.io/card-mode?grouping=no&sort=stars">CNCF landscape</a>
+  <br />
+  <img src="https://raw.githubusercontent.com/cncf/artwork/master/other/cncf/horizontal/white/cncf-white.svg" alt="CNCF" width="300">
+</p>
 
 <img src="https://user-images.githubusercontent.com/1153921/95269366-1b814680-07ee-11eb-8ff4-c1b0b8758499.png" alt="---" style="max-width: 100%;" />