Added usage.

README.md

@@ -19,7 +19,7 @@
 
 ## Introduction [↟](#contents)
 
-This is a utility library created and used simply for aesthetics.
+This is a utility library created and used simply for aesthetics. 
 
 ## Dependencies [↟](#contents)
 
@@ -48,7 +48,49 @@ And then do the usual:
 
 ## Usage [↟](#contents)
 
-Add content to me here!
+To use this library, one does the following (usually in an include file):
+
+1. Create a function that returns a list of function names as they would be called in an LFE application.
+1. Create a generator function that will convert these to Erlang names and then look them up in the specified Erlang module.
+1. Call the generate function in the include.
+1. Use the include in your application.
+
+The [moneta](https://github.com/lfex/moneta) project makes heavy use of `kla`; here's an excerpt of the "query" include file:
+
+``` lisp
+(eval-when-compile
+  (defun get-api-funcs ()
+    '((append 1) (append 2)
+      (cursor 1) (cursor 2)
+      (delete-cursor 1)
+      (eval 1) (eval 2)
+      (e 1) (e 2)
+      (fold 3) (fold 4)
+      (format-error 1)
+      (info 1) (info 2)
+      (keysort 2) (keysort 3)
+      (next-answers 1) (next-answers 2)
+      (q 1) (q 2)
+      (sort 1) (sort 2)
+      (string-to-handle 1) (string-to-handle 2) (string-to-handle 3)
+      (table 2))))
+
+(defmacro generate-api ()
+  `(progn ,@(kla:make-funcs (get-api-funcs) 'qlc)))
+
+(generate-api)
+```
+
+Then, in the library source file `mnt-qry`:
+
+``` lisp
+(defmodule mnt-qry
+  (export all))
+
+(include-lib "moneta/include/mnt-qry.lfe")
+```
+
+at which point all the functions listed in `get-api-funcs` are now available for use in `mnt-qry`. Calling the Lisp-style functions in `mnt-qry` will result in calls to the under-score functions in the Erlang `qlc` library.
 
 [//]: ---Named-Links---
 
@@ -59,7 +101,7 @@ Add content to me here!
 [gh-actions-badge]: https://github.com/lfex/kla/workflows/ci%2Fcd/badge.svg
 [gh-actions]: https://github.com/lfex/kla/actions
 [lfe]: https://github.com/lfe/lfe
-[lfe badge]: https://img.shields.io/badge/lfe-1.3.0-blue.svg
+[lfe badge]: https://img.shields.io/badge/lfe-2.1-blue.svg
 [erlang badge]: https://img.shields.io/badge/erlang-21%20to%2026-blue.svg
 [versions]: https://github.com/lfex/lxml/blob/master/.github/workflows/cicd.yml
 [github tags]: https://github.com/lfex/kla/tags