Add a Makefile for maintainers and hackers

Author: joachifm

Makefile

@@ -0,0 +1,22 @@
+# For maintainers. Use `cabal install` instead.
+
+CTAGS = hasktags --ctags
+ETAGS = hasktags --etags
+
+SRC = $(shell find Network -type f -name '*.hs')
+
+.PHONY: all maintainer-clean
+
+all:
+
+maintainer-clean:
+	@rm -f TAGS tags ChangeLog
+
+ChangeLog:
+	@git log --summary HEAD > ChangeLog
+
+TAGS: $(SRC)
+	@$(ETAGS) $^
+
+tags: $(SRC)
+	@$(CTAGS) $^