implement the basic functionality

.gitignore

@@ -1,3 +1,7 @@
 # NPM dependencies
 node_modules
 *.log
+# VIM backup files
+.*.swp
+.*.swo
+*~

README.md

@@ -1,12 +1,13 @@
 # ENVy
 
-Handle your environment properties from a simple .json file.
+Handle your project environment properties from a simple .json file.
 
 ## Installation
 
 To install simply use the node package manager (NPM):
+
 ```
-	[sudo] npm install envy
+[sudo] npm install envy
 ```
 
 ## Motivation
@@ -17,12 +18,53 @@ to handle many environments.
 
 ## Usage
 
+### File format
+
+The file defines what is your default environment from which all other 
+environments will inherit their properties.
+
+In the following example the ```"development"``` environment will be selected 
+by default. _Selecting an environment in your configuration file will also make
+ its properties to be inherited in the other environments._
+Continuing with the example, the ```"production"``` environment will also be 
+configured to use the port ```3000```, but its database url will be 
+```"mongodb://localhost/prod-app"``` instead of 
+```"mongodb://localhost/dev-app"```.
+
+```json
+{
+	"environment": "development",
+
+	"development": {
+		"port": 3000,
+		"database": {
+			"url": "mongodb://localhost/dev-app"
+		}
+	},
+
+	"production": {
+		"database": {
+			"url": "mongodb://localhost/prod-app"
+		}
+	}
+}
+```
+
+### Using it in your program
+
+When you ```require``` the envy module it will try to load the default configuration file: ```./config.json```.
+
 ``` js
-	var envy = require('envy');
+var envy = require('envy');
 
-	envy.load('config.json');
+envy.config.your.properties;
 ```
 
+If you want to select an environment you will need to set the ```NODE_ENV``` 
+environment variable:
+
+```NODE_ENV=production node your-app.js```
+
 ## Future features
 
 We plan on extending the current features and include:

envy.js

@@ -0,0 +1,22 @@
+// envy.js
+
+var envy = module.exports;
+
+// Load the .json file containing the 
+envy.load = function(filename) {
+
+	var config = require(filename);
+
+	// load default environment
+	envy.config = config[config.environment];
+
+	// Overwrite properties
+	if (process.env.NODE_ENV && config[process.env.NODE_ENV]) {
+		for (var property in config[process.env.NODE_ENV]) {
+			envy.config[property] = config[process.env.NODE_ENV][property];
+		}
+	}
+
+};
+
+envy.load('./config.json');