Add Makefile that has test target

Makefile

@@ -0,0 +1,20 @@
+emacs ?= emacs
+
+shrc_loadables = sh bash zsh
+
+.PHONY: all default test emacs
+
+all: default
+
+emacs: emacs.el
+	$(emacs) -q --debug-init --batch --load $< -f my-auto-install-package
+
+
+test: test_el test_shrc
+
+test_shrc: shrc
+	sh -exc 'for sh in $(shrc_loadables); do $$sh -n $<; done'
+
+test_el: emacs.el
+	$(emacs) -q --debug-init --batch --eval "(setq debug-on-error t)" \
+		--load $< --kill