Add codex docs.

.gitignore

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+docs/build

docs/example.lisp

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+* (let ((stream (flexi-streams:make-in-memory-output-stream)))
+    (binary:write-u32 stream 1024)
+    (binary:write-u32 stream 1024 :endian :big)
+    (format t "Stream contents: ~A~%"
+      (flexi-streams:get-output-stream-sequence stream)))
+#(0 4 0 0 0 0 4 0)
+NIL
+* (let ((stream (flexi-streams:make-in-memory-input-stream #(0 4 0 0 0 0 4 0))))
+    (format t "Read ~A~%" (binary:read-u32 stream))
+    (format t "Read ~A~%" (binary:read-u32 stream :endian :big)))
+Read 1024
+Read 1024
+NIL

docs/manifest.lisp

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+(:docstring-markup-format :scriba
+ :systems (:binary)
+ :documents ((:title "Binary"
+              :authors ("Kyle Isom")
+              :output-format (:type :multi-html
+                              :template :minima)
+              :sources ("manual.scr"))))

docs/manual.scr

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+@begin(section)
+@title(Index)
+
+@b(binary) contains functions for reading and writing integers from
+binary streams
+
+@begin(deflist)
+
+@term(Source)
+@begin(def)
+
+The source code may be obtained from
+@link[uri="https://github.com/kisom/binary/"](Github).
+
+@end(def)
+
+@term(Setup and Usage)
+@begin(def)
+
+@b(binary) requires
+@link[uri="https://quicklisp.org/"](Quicklisp). The repository should
+be cloned into the @c(local-projects) directory under the Quicklisp
+home.
+
+To use @b(kutils), either add it to the @c(:depends-on) section of
+your project's @c(.asd), or @c(ql:quickload :kutils).
+
+@end(def)
+
+@term(License)
+@begin(def)
+
+@b(binary) is released under the
+@link[uri="https://raw.githubusercontent.com/kisom/binary/master/LICENSE"](MIT)
+license.
+
+@end(def)
+@end(deflist)
+@end(section)
+
+@begin(section)
+@title(Overview)
+
+The @b(binary) package was written to parse and serialise certain
+network messages while working on implementing a client library for a
+certain protocol in Common Lisp.
+
+@code(@include[path=example.lisp]())
+@end(section)
+
+@begin(section)
+@title(API Reference)
+
+@cl:with-package[name="binary"](
+@cl:doc(function read-U8)
+@cl:doc(function read-U16)
+@cl:doc(function read-U32)
+@cl:doc(function read-U64)
+@cl:doc(function read-I8)
+@cl:doc(function read-I16)
+@cl:doc(function read-I32)
+@cl:doc(function read-I64)
+@cl:doc(function write-U8)
+@cl:doc(function write-U16)
+@cl:doc(function write-U32)
+@cl:doc(function write-U64)
+@cl:doc(function write-I8)
+@cl:doc(function write-I16)
+@cl:doc(function write-I32)
+@cl:doc(function write-I64))
+
+@end(section)