chore(content): add LF footer

Signed-off-by: Vaughn Dice <[email protected]>

Author: vdice

content/en/_index.md

@@ -62,4 +62,8 @@ Check out the [contribution guidelines](/docs/contrib/) to learn how to get invo
 
 <div class="text-center">We are a <a href="https://www.cncf.io">Cloud Native Computing Foundation</a> sandbox project.</div>
 
+<p>
+  <div class="text-center">The Linux Foundation® (TLF) has registered trademarks and uses trademarks. For a list of TLF trademarks, see <a href="https://www.linuxfoundation.org/trademark-usage/">Trademark Usage </a></div>
+</p>
+
 {{% /blocks/lead %}}