Added README and screenshots.

README.md

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+# *** HACK DETECTION ***
+
+This is a simple command line utility that can check if a ROM hack
+appears to be a hex-edited binary hack instead of a hack based on
+a disassembly.
+
+## How to use:
+
+```
+$ hack-detection [Source ROM] [Hacked ROM]
+```
+
+* Source ROM: The original ROM, e.g. "Sonic 1 Rev00.gen".
+* Hacked ROM: The hacked ROM, e.g. "Sonic 1337.bin".
+
+## Screenshots
+
+These examples use Sonic 1 Rev00 as the source ROM and
+[Sonic 1337](https://info.sonicretro.org/Sonic_1337) as the hacked ROM.
+
+![hack-detection on Windows XP](screenshots/hd-winxp.png)
+
+![hack-detection on xterm (KDE5)](screenshots/hd-xterm.png)
+
+## License
+
+hack-detection is licensed under the GNU AGPLv3. See [LICENSE.md](LICENSE.md)
+for more information.