MEDIUM: add systemd service

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>
diff --git a/contrib/systemd/Makefile b/contrib/systemd/Makefile
new file mode 100644
index 0000000..e542c23
--- /dev/null
+++ b/contrib/systemd/Makefile
@@ -0,0 +1,8 @@
+PREFIX = /usr/local
+SBINDIR = $(PREFIX)/sbin
+
+haproxy.service: haproxy.service.in
+	sed -e 's:@SBINDIR@:'$(strip $(SBINDIR))':' $< > $@
+
+clean:
+	rm -f haproxy.service