added cleanup and cashier asset vector to readme

todo.md

@@ -10,6 +10,11 @@
 - [X] delete zkvm
 - [X] SOL bridge poc
 - [ ] Optional Cargo "features" for cashierd/darkfid, to {en,dis}able different chains
+- [ ] delete ALL old directories
+- [ ] unpluralize directories
+- [ ] delete tutorial
+- [ ] fix spelling mistakes
+- [ ] make cashier asset vector
 
 ## deposit