add first TODO (valgrind/mem check)

STATUS.org

@@ -44,6 +44,9 @@
 - [[https://en.wikipedia.org/wiki/Zobrist_hashing][Positions hashing]] / transposition detection
 
 * Next steps planned
+*** 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