Added Makefile to simplify builds

Makefile

@@ -0,0 +1,21 @@
+# Equi reference implementation build project
+
+PROJNAME=equi
+CFILES=equi.c
+PBTDIR=platform-build-tools
+
+desktopcc:
+	cc -std=c89 -Os -o $(PROJNAME) $(CFILES)
+	strip $(PROJNAME)
+
+tcc:
+	tcc -std=c89 -o $(PROJNAME) $(CFILES)
+
+apple2-build:
+	cl65 --standard c89 -O -Os -t apple2 -o $(PROJNAME).apple2 $(CFILES)
+
+apple2: apple2-build
+	cp $(PBTDIR)/apple2/tpl.dsk equi.dsk
+	java -jar $(PBTDIR)/apple2/ac.jar -p $(PROJNAME).dsk $(PROJNAME).system sys < $$(cl65 --print-target-path)/apple2/util/loader.system
+	java -jar $(PBTDIR)/apple2/ac.jar -as $(PROJNAME).dsk $(PROJNAME) bin < $(PROJNAME).apple2
+	rm *.o *.apple2