doc: update README.md (#171)

Update README.md with OSOR Award note

Author: bfabio

README.md

@@ -33,6 +33,10 @@
       Voting procedure</a>
     <span> | </span>
     <a href="CONTRIBUTING.md">Contributing</a>
+    <br>
+    <br>
+    📣 publiccode.yml is one of the 6 candidates for the OSOR Achievement Award 2023
+    👉 <a href="https://joinup.ec.europa.eu/collection/open-source-observatory-osor/osor-awards-2023">Cast your vote</a> 👈 
   </h3>
 </div>