Updates README to include LuaRocks installation instructions.

Author: manoelcampos

README.md

@@ -13,6 +13,15 @@ The code (and documentation) is not complete yet, however it is usable and this
 
 The API is relatively stable however there may be some detailed changes.
 
+# Installation
+If you clone this repository, you are download all the module source code and can run the examples directly.
+However, if you want to use the module inside your own project, the best way is to download it using 
+LuaRocks at the command line:
+
+```bash
+luarocks install xml2lua
+```
+
 # How to use
 A simplified example which parses an XML directly from a string is presented below:
 

xml2lua-1.0-0.rockspec

@@ -7,8 +7,8 @@ source = {
 description = {
    summary = "An XML Parser written entirely in Lua 5.",
    detailed = [[
-      Enables parsing an XML file and converting it to a Lua table,
-      which can be handled directly by your application.
+   Enables parsing an XML file and converting it to a Lua table,
+   which can be handled directly by your application.
    ]],
    homepage = "http://manoelcampos.github.io/xml2lua/",
    license = "MIT"