add todo on measuring codec flash/ram usage

README.md

@@ -30,6 +30,7 @@ Missing:
 * Expose more configuration options
 * Legacy Bluetooth (probably won't happen unless it's needed for qualification).*
 * Testing preparing for qualification (see https://github.com/auto-pts/auto-pts which is an automated framework we might be able to use)
+* Check serialization/deserialization code size and improve
 
 ## Example