add first TODO (valgrind/mem check)

STATUS.org

@@ -43,7 +43,10 @@
 - Book-keeping of moves during search (did not decide the method).
 - [[https://en.wikipedia.org/wiki/Zobrist_hashing][Positions hashing]] / transposition detection
 
-* Next steps planned
+* Next steps planned (no specific order)
+*** Memory cleanup
+- proper recusive position/moves cleanup in search() and pvs()
+- use valgrind to find possible other unfreed memory
 *** Replace the current interface with a basic xboard one
 1. Check which commands are necessary/mandatory.
 1. This will allow easy testing with common software