Add Makefile for simplified use

230130-hookgamesendto/Makefile

+subdir = hookdll injector
+cleandir = $(addprefix _clean_, $(subdir))
+
+all: $(subdir)
+	@ echo Make done !
+
+$(subdir):
+	$(MAKE) -C $@
+
+$(cleandir):
+	$(MAKE) clean -C $(patsubst _clean_%, %, $@)
+
+.PHONY: clean $(subdir)
+
+clean: $(cleandir)
+	@ del bin\*.exe bin\*.dll
+	@ echo Clean done !