Document new commands and quick start

README.md

@@ -5,6 +5,12 @@ See [docs/roadmap.md](docs/roadmap.md) and
 [docs/adr/DP-001_schema_v1.1.md](docs/adr/DP-001_schema_v1.1.md)
 for the current delivery roadmap and schema.
 
+## Quick Start
+
+Follow the short walkthrough in
+[docs/marlin_demo.md](docs/marlin_demo.md) to build the
+binary and test Marlin on a sample project.
+
 ## CLI Cheatsheet
 
 The full command reference is generated during the build of the CLI. See
@@ -21,6 +27,13 @@ Named **collections** act like playlists of files. Create one with
 `marlin view save <view> "tag:todo"`, list all views using
 `marlin view list` and execute one with `marlin view exec <view>`.
 
+Other handy commands include:
+
+- `marlin watch <dir>` to keep the index updated in real time.
+- `marlin backup run` to create or prune database backups.
+- `marlin link add` to relate files with typed edges.
+- `marlin annotate add` to attach notes or highlights.
+
 ## License
 
 Licensed under the [MIT License](LICENSE).