Update to-do.md

to-do.md

@@ -4,6 +4,7 @@
 4. predict the primary IPC or CPC code of a patent application given (some subset of) the text of the application.
 5. abstractive summarization: given the claims or claims section of a patent application, generate the abstract.
 6. chatwPatent
+7. Given the claims, summary, and background art, generate an abstract.
 
 
 dataset--