docs: more exp tips

exp/README.md

@@ -2,8 +2,20 @@
 
 > Experimental programs for prototyping outside of the main `gshmm` UI
 
+## `bleve.go`
+
+Testbed for indexing  & retrieval.
+
 ```
 go run bleve.go
 ```
 
 You may need to `rm -rf *.bleve` to clean up previous index runs.
+
+You can install the CLI with:
+
+```
+go install github.com/blevesearch/bleve/v2/cmd/bleve@latest
+```
+
+And then do stuff like `bleve query test.bleve "enhanced"` 👍