Create a plain-text README file for release distribution.

Makefile

@@ -46,7 +46,7 @@ dist:
 	cp -a $(PROJ)-$(VER).upd $(PROJ)-$(VER)/$(PROJ)-$(VER).upd
 	cp -a blinky_test/blinky.hex $(PROJ)-$(VER)/hex/alt/blinky-test-f1-$(VER).hex
 	cp -a COPYING $(PROJ)-$(VER)/
-	cp -a README.md $(PROJ)-$(VER)/
+	cp -a README $(PROJ)-$(VER)/
 	cp -a RELEASE_NOTES $(PROJ)-$(VER)/
 	$(MAKE) clean
 	$(MAKE) mcu=stm32f7 all

README

@@ -0,0 +1,14 @@
+Greaseweazle Firmware
+---------------------
+Keir Fraser <keir.xen@gmail.com>
+https://github.com/keirf/greaseweazle-firmware
+
+This distribution contains device firmware for Greaseweazle USB
+interface boards.
+
+Greaseweazle documentation and downloads:
+  https://github.com/keirf/greaseweazle/wiki/
+
+Source code, and all binary releases, are freely redistributable in
+any form. Please see the the COPYING file included in this
+distribution.