Document resin/config

lib/resin/config/config.coffee

@@ -1,8 +1,23 @@
 fs = require('fs')
 errors = require('../errors/errors')
 
+# Read JSON configuration file
+#
+# @private
+#
 # User config loading should be sync, as we need to
 # extend this module with the result before exporting
+#
+# @param {String} configFile configuration file path
+# @return {Object} Parsed configuration file
+#
+# @throw {InvalidConfigFile} Will throw an error if file doesn't exist
+# @throw {InvalidConfigFile} Will throw an error if file is not JSON
+#
+# @example Read config file
+#		contents = resin.config.loadUserConfig('/Users/me/resin-custom.json')
+#		console.log(contents.remoteUrl)
+#
 exports.loadUserConfig = (configFile) ->
 	return if not fs.existsSync(configFile)