new readme

README.md

@@ -8,7 +8,7 @@ Dependencies
 ------------
 
 * AsciiDoc
-* Deck.js (already included in this repo)
+* Deck.js
 
 Optional:
 
@@ -18,7 +18,9 @@ Optional:
 Installation
 ------------
 
-All you need to do is to make sure your asciidoc can properly find `deckjs.conf`. For asciidoc's configuration file loading strategy, please refer to [this guide](http://www.methods.co.nz/asciidoc/userguide.html#X7).
+If you don't have deck.js you can download it automatically with `make install`. Or you can get it manually from its official [link](https://github.com/imakewebthings/deck.js/zipball/stable), and rename the unzipped directory to `deck.js`.
+
+The second thing you need to do is to make sure your asciidoc can properly find `deckjs.conf`. For asciidoc's configuration file loading strategy, please refer to [this guide](http://www.methods.co.nz/asciidoc/userguide.html#X7).
 
 The easiest way is to put `deckjs.conf` and the asciidoc file you wrote in the same directory.
 
@@ -32,4 +34,6 @@ asciidoc -f deck.js.conf file.asciidoc
 
 file.asciidoc is the asciidoc file you wrote. 
 
+Remember to put `deck.js` and generated slide into the same directory.
+