docs: update README

README.md

@@ -1,7 +1,38 @@
 # cobra2snooty
 [![CI](https://github.com/mongodb-labs/cobra2snooty/actions/workflows/pr.yml/badge.svg)](https://github.com/mongodb-labs/cobra2snooty/actions/workflows/pr.yml)
 
-WIP
+## Generate Snooty docs for the entire command tree
+
+This program can actually generate docs for the mongocli command in the mongocli project
+
+```go
+package main
+
+import (
+	"log"
+	"os"
+
+	"github.com/mongodb/mongocli/internal/cli/root"
+	"github.com/mongodb-labs/cobra2snooty"
+)
+
+func main() {
+	var profile string
+	const docsPermissions = 0766
+	if err := os.MkdirAll("./docs/command", docsPermissions); err != nil {
+		log.Fatal(err)
+	}
+
+	mongocli := root.Builder(&profile, []string{})
+
+	if err := cobra2snooty.GenSnootyTree(mongocli, "./docs/command"); err != nil {
+		log.Fatal(err)
+	}
+}
+```
+
+This will generate a whole series of files, one for each command in the tree, in the directory specified (in this case "./docs/command")
+
 
 ## License