added cleanup and cashier asset vector to todo.md

todo.md

@@ -10,6 +10,9 @@
 - [X] delete zkvm
 - [X] SOL bridge poc
 - [ ] Optional Cargo "features" for cashierd/darkfid, to {en,dis}able different chains
+- [ ] delete ALL old directories and files
+- [ ] fix spelling mistakes
+- [ ] make cashier asset vector 
 
 ## deposit