Added a Makefile build for the HelloPlaydate example target.

Examples/HelloPlaydate/Makefile

@@ -0,0 +1,26 @@
+REPO_ROOT := $(shell git rev-parse --show-toplevel)
+PRODUCT := HelloPlaydate.pdx
+include $(REPO_ROOT)/Examples/swift.mk
+
+# MARK: - Build PlayDate Wrapper Swift Module
+build/Modules/playdate_device.o: $(REPO_ROOT)/Sources/PlayDate/*.swift
+	@mkdir -p build/Modules
+	$(SWIFT_EXEC) $(SWIFT_FLAGS) $(SWIFT_FLAGS_DEVICE) -c $^ -emit-module -o $@
+
+build/Modules/playdate_simulator.o: $(REPO_ROOT)/Sources/PlayDate/*.swift
+	@mkdir -p build/Modules
+	$(SWIFT_EXEC) $(SWIFT_FLAGS) $(SWIFT_FLAGS_SIMULATOR) -c $^ -emit-module -o $@
+
+# MARK: - Build Game Swift Object
+build/game_device.o: Sources/HelloPlaydate/*.swift | build/Modules/playdate_device.o
+	$(SWIFT_EXEC) $(SWIFT_FLAGS) $(SWIFT_FLAGS_DEVICE) -c $^ -o $@
+$(OBJDIR)/pdex.elf: build/game_device.o
+OBJS += build/game_device.o
+# The wrapper object carries symbols that are not emitted into the game
+# object, such as the posix_memalign shim the Embedded Swift runtime needs.
+OBJS += build/Modules/playdate_device.o
+
+build/game_simulator.o: Sources/HelloPlaydate/*.swift | build/Modules/playdate_simulator.o
+	$(SWIFT_EXEC) $(SWIFT_FLAGS) $(SWIFT_FLAGS_SIMULATOR) -c $^ -o $@
+$(OBJDIR)/pdex.${DYLIB_EXT}: build/game_simulator.o
+SIMCOMPILER += build/game_simulator.o