Added ZIP file

README.md

@@ -1,6 +1,65 @@
-After cloning this repository, `cd` into the root directory and run
-the following two commands:
+Learn PixiJS
+============
+
+This is the code repository for the book [Learn
+PixiJS](http://www.springer.com/us/book/9781484210956).
+
+There are two ways to access the source code: by downloading the ZIP file or by
+cloning this repository.
+
+The ZIP file
+-----------
+
+The easiest way is just to download the ZIP file. It contains a
+frozen snapshot of all the source code for *Learn PixiJS* as it was on the
+day the book was published. That means it's guaranteed to work with code in the book. 
+
+Clone this repository
+---------------------
+
+Alternatively, you can use git to clone this repository. (If you don't
+know how to use git (you can find out
+here)[https://github.com/kittykatattack/learningGit].) Cloning the
+repository will
+give you the latest version of the submodules, including the latest
+version of Pixi. (Be aware that the source code in the book was tested
+with Pixi 3.0.7. If you are using a later version of
+Pixi you may encounter incompatibilities.)
+
+To clone this repository, run the following in the command line:
+```
+git clone [email protected]:kittykatattack/learningGit.git
+```
+When it's finished run the following two commands:
 ```
 git submodule init
 git submodule update
 ```
+To optionally update the submodules to the very latest versions, run this
+command:
+```
+git submodule foreach git pull origin master
+```
+This will pull the latest versions of the submodules from their
+repositories.
+
+Launching a web server
+------------------
+
+You'll need to launch a web server in the root repository directory. A
+modern text editor like (Light Table)[http://lighttable.com],
+(Brackets)[http://brackets.io] or (Atom)[https://atom.io] will
+launch one for you automatically, directly from the editor, when you
+open and view an HTML file in the browser. 
+
+Or you could launch a web server directly from the command line using
+(http-server)[https://github.com/indexzero/http-server]. After the server starts, navigate to
+`http://localhost:8080/` in your browser and you'll be able to
+interact with working
+versions of all the example files in the book.  
+
+Keeping up with Pixi
+--------------------
+
+Pixi is an actively developed library, so make sure you (keep an eye on
+Pixi's code repository)[https://github.com/pixijs/pixi.js] for any changes to the API.