Adds makefile

Issue #3

This adds install and uninstall options. It doesn't yet run test due to
issues I'm having with shellcheck and sourced files

Makefile

@@ -0,0 +1,17 @@
+# kb
+.POSIX:
+
+# paths
+PREFIX = /usr/local
+#MANPREFIX = $(PREFIX)/share/man
+
+install:
+	mkdir -p $(DESTDIR)$(PREFIX)/bin
+	sed '/^source/d' inc/* kb > $(DESTDIR)$(PREFIX)/bin/kb
+	chmod +x $(DESTDIR)$(PREFIX)/bin/kb
+
+
+uninstall:
+	rm -f $(DESTDIR)$(PREFIX)/bin/kb
+
+.PHONY: install uninstall