docs: add README and CHANGELOG

CHANGELOG.md

@@ -0,0 +1,8 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]

README.md

@@ -1,3 +1,33 @@
-# fpk
+# fpk (Forlorn Pak)
 
-Packs a directory tree into a single flat binary archive
+[![License: MPL 2.0](https://img.shields.io/badge/License-MPL_2.0-brightgreen.svg)](https://opensource.org/licenses/MPL-2.0)
+
+Packs a directory tree into a single flat binary archive. C89, no dependencies.
+
+## Building
+
+```bash
+./build.sh debug release tools   # Unix
+build.bat debug release tools    # Windows
+```
+
+## Usage
+
+```bash
+fpack output.fpk assets/
+funpack output.fpk [unpacked/]   # dir defaults to "output" if omitted
+```
+
+```c
+#include <fpk/fpk.h>
+
+fpk_t *pak = fpk_open("assets.fpk");
+fpk_find(pak, "some/file.bin", &data, &size);
+fpk_close(pak);
+```
+
+See [docs/format.md](docs/format.md) for the on-disk layout.
+
+## License
+
+Mozilla Public License 2.0 (MPL-2.0)