Complete CommandKit consumer documentation

examples/simple/README.md

@@ -0,0 +1,14 @@
+# Simple consumer
+
+Run the maintained example with:
+
+```sh
+go run . config show
+go run . greet
+go run . greet --count=0 --tag=first --tag second
+```
+
+The `config` family comes from one typed ConfigKit scope. The custom `greet`
+command uses CommandKit's typed bindings and shows the difference between an
+omitted `--count` and an explicitly supplied zero, plus ordered repeated tags.
+The configuration is synthetic and stays in memory.