Add Makefile for static analysis and automatic testing

Inspired by https://nullprogram.com/blog/2020/01/22/ and fancy to use make :)
Yay make!

Makefile

@@ -0,0 +1,26 @@
+# Inspired by https://nullprogram.com/blog/2020/01/22/
+
+.POSIX:
+
+EMACS = emacs
+LDFLAGS = -L site-lisp $(patsubst %,-L %, $(wildcard elpa/*/))
+EL = site-lisp/timeline-tools.el site-lisp/db-customize.el site-lisp/db-emms.el site-lisp/db-eshell.el site-lisp/db-hydras.el site-lisp/db-mail.el site-lisp/db-music.el site-lisp/db-org.el site-lisp/db-projects.el site-lisp/db-utils.el site-lisp/db-utils-test.el site-lisp/timeline-tools.el
+TEST = site-lisp/timeline-tools-test.el
+ELC = $(EL:.el=.elc)
+TESTC = $(TEST:.el=.elc)
+
+compile: $(ELC) $(TESTC)
+
+timelinetools-test.elc: timeline-tools.elc
+
+test: $(TESTC)
+	@echo "Testing $(TESTC)"
+	@$(EMACS) -Q --batch $(LDFLAGS) $(patsubst %,-l %, $(TESTC)) -f ert-run-tests-batch
+
+clean:
+	rm -f $(ELC) $(TESTC)
+
+.SUFFIXES: .el .elc
+.el.elc:
+	@echo "Compiling $<"
+	@$(EMACS) -Q --batch $(LDFLAGS) -f batch-byte-compile $<