Add more comprehensive description

Author: Max Kolodezniy

README.md

@@ -10,24 +10,24 @@ Run AWS Lambda function locally!
 ```
 
 ## Usage
-Just specify function name (can be in nested directory), `event` object file.
-Optionally you also may replace default `context` object and timeout (30 seconds by default).
+Just specify `function name` (can be in nested directory), `event` object file.
+Optionally you also may replace default `context` object and `timeout` (30 seconds by default).
 ```
 $ cat function.js
 exports.handler = function(event, context)
 {
     context.done(event, context);
 };
 
-$ aws-lambda-local git:(master) ✗ cat event.json
+$ cat event.json
 {
     "obj" : { "a" : "b" },
     "int"   : 1,
     "str"   : "qwerty",
     "arr"   : [1, 2, 3, 4]
 }
 
-$ aws-lambda-local git:(master) ✗ ./lambda-local.js -f function -e event.json -t 20
+$ ./lambda-local.js -f function -e event.json -t 20
 ERROR
 --------------------------------
 {