Added quick and dirty install Makefile for systems where the package manager doesn't have it.

Makefile

@@ -0,0 +1,15 @@
+NAME=zsh-syntax-highlighting
+
+DIRS=highlighters tests
+INSTALL_DIRS=`find $(DIRS) -type d 2>/dev/null`
+DOC_FILES=*.md
+ZSH_FILES=*.zsh
+
+PREFIX?=/usr/local
+
+SHARE_DIR=$(DESTDIR)$(PREFIX)/share/$(NAME)
+
+install:
+	for dir in $(INSTALL_DIRS); do mkdir -p $(SHARE_DIR)/$$dir; done
+	find $(DIRS) -type f -print0 | xargs -0 -I % cp % $(SHARE_DIR)/%
+	cp -r $(DOC_FILES) $(ZSH_FILES) $(SHARE_DIR)