updated Readme.md and changed index.js require.

Author: megashrieks

README.md

@@ -4,11 +4,19 @@ Its an **online programming ide** for the compilation of simple programs, Mostly
 used in competitive programming servers to run the code according to certain set
 of rules.
 
+## installation
+`npm install code-runner`
+ 
+ ### additional dependencies
+  1. To run `C` or `C++` code in the module you must have `gcc` installed in your system.
+  2. To run `python` code you must have `python` installed in your system.
+
+
 ## usage
 
 ```javascript
 var runner = require('code-runner');
-runner(code,options,function(){
+runner(code,options,function(err,data){
   //callback function
   ...
 });
@@ -19,3 +27,7 @@ runner(code,options,function(){
   1. `timeout` : time in ms, specifies the time after which the program must be
      terminated.
   2. `language` : the name of the language of the given code.
+* `err` is the error passed to the callback function if there is an error while calling the function.
+* `data` is the output passed to the callback function which contains the property
+  1. `error` : error while executing the code.
+  2. `total` : output of the code that ran.

index.js

@@ -1,18 +1 @@
-var runner = require("./modules/code-runner");
-// runner(
-//   `#include <stdio.h>
-//   int main(){
-//     char s[5];
-//     while(true);
-//     return 1;
-//   }`,
-//   {
-//     language: "C",
-//     timeout:100
-//   },
-//   function(err, data) {
-//     if (err) throw err;
-//     console.log(data);
-//   }
-// );
-module.exports = runner;
+module.exports = require("./modules/code-runner");