add noise cancelling secondary feature

src/03_project-documentation/project-plan/long-term-plan.tex

@@ -34,6 +34,7 @@
                 \item All in-house models as assistants
                 \item Saving chat over sessions
                 \item Receipe suggestions
+                \item Noise cancelling for audio
             \end{itemize}
 
     \subsection{Epics}\label{sec:project-documentation/long-term-plan/epics}