Add make install

Makefile

@@ -4,13 +4,17 @@ MRBSRCS := $(wildcard mrblib/xkremap/*.rb)
 MRBCSRCS := $(wildcard src/*.[ch])
 # Using master to apply https://github.com/mruby/mruby/pull/3192
 REVISION=0ff3ae1fbaed62010c54c43235e29cdc85da2f78
-.PHONY: all clean
+DESTDIR := /usr/local/bin
+.PHONY: all clean install
 
 all: xkremap
 
 clean:
 	rm -rf mruby/build/host
 
+install: xkremap
+	mv xkremap $(DESTDIR)/xkremap
+
 xkremap: mruby/build/host/bin/xkremap
 	cp mruby/build/host/bin/xkremap xkremap
 

README.md

@@ -32,7 +32,7 @@ because it embeds mruby to evaluate configuration.
 $ git clone https://github.com/k0kubun/xkremap
 $ cd xkremap
 $ make
-$ sudo make install # or `make DESTDIR=~/bin/xkremap install`
+$ sudo make install # or `make DESTDIR=~/bin install`
 ```
 
 ## Usage