kyaml: refactor command documentation into .md files from go files

No new documentation added.

cmd/config/README.md

@@ -1,4 +1,21 @@
 # cmd/config
 
-This package exists to expose kyaml filters directly as cli commands for the purposes
+This package exists to expose config filters directly as cli commands for the purposes
 of development of the kyaml package and as a reference implementation for using the libraries.
+
+## Docs:
+
+- [commands](docs/commands)
+- [api-conventions](docs/api-conventions)
+
+## Build Command
+
+Build the `config` command under `GOBIN`
+
+    $ make
+
+## Run Tests
+
+Run all tests, linting, etc and build
+
+    $ make all