rtc-tools: Add a Makefile

Add a Makefile to make installation and uninstallation
process easier.

Signed-off-by: Fabio Estevam <festevam@denx.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20220127225928.34214-1-festevam@gmail.com
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..71a4c9c
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,16 @@
+prefix ?= /usr
+bindir ?= $(prefix)/bin
+
+EXEC = rtc-range rtc rtc-sync
+
+all: $(EXEC)
+
+clean:
+	$(RM) $(EXEC)
+
+install:
+	install -d $(DESTDIR)$(bindir)
+	install $(EXEC) $(DESTDIR)$(bindir)
+
+uninstall:
+	$(RM) -r $(addprefix $(DESTDIR)$(bindir)/,$(EXEC))