Adding first draft of README.

README.md

@@ -2,3 +2,93 @@ viper
 =====
 
 Go configuration with fangs
+
+## What is Viper?
+
+Viper is a complete configuration solution. Designed to work within an
+application to handle file based configuration and seamlessly marry that with
+command line flags which can also be used to control application behavior.
+
+## Why Viper?
+
+When building a modern application you don’t want to have to worry about
+configuration file formats, you want to focus on building awesome software.
+Viper is here to help with that.
+
+Viper does the following for you:
+
+1. Find, load and marshall a configuration file in YAML, TOML or JSON.
+2. Provide a mechanism to setDefault values for your different configuration options
+3. Provide a mechanism to setOverride values for options specified through command line flags.
+4. Provide an alias system to easily rename parameters without breaking existing code.
+5. Make it easy to tell the difference between when a user has provided a command line or config file which is the same as the default.
+
+Viper believes that:
+
+1. command line flags take precedence over options set in config files
+2. config files take precedence over defaults
+
+Config files often can be found in multiple locations. Viper allows you to set
+multiple paths to search for the config file in.
+
+Viper configuration keys are case insensitive.
+
+## Usage
+
+### Initialization
+
+	viper.SetConfigName("config") // name of config file (without extension)
+	viper.AddConfigPath("/etc/appname/")   // path to look for the config file in
+	viper.AddConfigPath("$HOME/.appname")  // call multiple times to add many search paths
+	viper.ReadInConfig() // Find and read the config file
+
+### Setting Defaults
+
+	viper.SetDefault("ContentDir", "content")
+	viper.SetDefault("LayoutDir", "layouts")
+	viper.SetDefault("Indexes", map[string]string{"tag": "tags", "category": "categories"})
+
+### Setting Overrides
+
+    viper.Set("Verbose", true)
+    viper.Set("LogFile", LogFile)
+
+### Registering and Using Aliases
+
+    viper.RegisterAlias("loud", "Verbose")
+
+    viper.Set("verbose", true) // same result as next line
+    viper.Set("loud", true)   // same result as prior line
+
+    viper.GetBool("loud") // true
+    viper.GetBool("verbose") // true
+
+### Getting Values
+
+    viper.GetString("logfile") // case insensitive Setting & Getting
+	if viper.GetBool("verbose") {
+        fmt.Println("verbose enabled")
+	}
+
+
+## Q & A
+
+Q: Why not INI files?
+
+A: Ini files are pretty awful. There’s no standard format and they are hard to
+validate. Viper is designed to work with YAML, TOML or JSON files. If someone
+really wants to add this feature, I’d be happy to merge it. It’s easy to
+specify which formats your application will permit.
+
+Q: Why viper?
+
+A: Viper is designed to be a companion to
+[Cobra](http://github.com/spf13/cobra). While both can operate completely
+independently, together they make a powerful pair to handle much of your
+application foundation needs.
+
+Q: Why Cobra?
+
+A: Is there a better name for a commander?
+
+