Add deterministic CAS tree objects

README.md

@@ -87,6 +87,7 @@ The bootstrap implementation provides:
 - `geth auth revoke <resource> <grant-id>`
 - local filesystem CAS commands: `add`, `get`, `hash`, `has`, `pin`, `unpin`,
   `cleanup`, `list`
+- local CAS tree objects describe file trees and are stored as CAS blobs
 - local DB resource registration: `geth db add <name> <path>` and
   `geth db status <name>` with schema and `crsql_changes` metadata; the DB
   crate and daemon can extract typed local `crsql_changes` batches through