Added README.md

README.md

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+# Steam Community for Node.js
+
+This lightweight module provides an easy interface to login to the Steam Community website. You can also login to the Steam Community website via [node-steam](https://github.com/seishun/node-steam)'s `webLogOn` method, but this module may be useful if you don't want to run an entire Steam instance.
+
+It supports Steam Guard but doesn't support CAPTCHAs, so make sure you don't provide Steam with an incorrect password.
+
+# Installation
+
+Install it from npm:
+
+    $ npm install steamcommunity
+
+# Usage
+
+First, instantiate the `SteamCommunity` object:
+
+```js
+var SteamCommunity = require('steamcommunity');
+var community = new SteamCommunity("username", "password");
+```
+
+Then, simply call the `login` method:
+
+```js
+community.login(function(err, sessionID, cookies, steamguard) {
+	// Do something with the sessionID and cookies.
+	// The steamguard parameter is only meaningful if you've entered a Steam Guard auth code, as shown below.
+});
+```
+
+# Steam Guard
+
+In order to authenticate with a Steam Guard authorization, you need to provide your 64-bit Steam ID and machineAuth value to the constructor:
+
+```js
+var SteamCommunity = require('steamcommunity');
+var community = new SteamCommunity("username", "password", "steamid64", "machineAuth");
+```
+
+If you don't have a prior authorization, you can get one by logging in as normal (without the steamID and machineAuth parameters). The callback to the `login` method will get `SteamGuard` as `err`. This means that an email has been sent to the email address tied to your account. Once you get the code, just call `login` again with the code as the first parameter:
+
+```js
+community.login('ABCDE', function(err, sessionID, cookies, steamguard) {
+	// steamguard is now an object with two properties: steamID and machineAuth. You'll want to save these and provide them to subsequent constructors.
+	// If you call login again on this instance of SteamCommunity, the Steam Guard machineAuth will be sent automatically so you don't need to reconstruct a new instance.
+});
+```
+
+# Methods
+
+## Constructor: SteamCommunity(username, password[, steamID, machineAuth])
+
+Instantiate a new instance of `SteamCommunity`. `steamID` and `machineAuth` are optional, but if you have them and your account is protectd by Steam Guard, you should provide them. Otherwise, you'll get a `SteamGuard` error when you try to login.
+
+## login([code, ]callback)
+
+Attempts to login to Steam Community using the credentials supplied in the constructor. If you have previously received a `SteamGuard` error and you have an email auth code, supply it here as the first parameter.
+
+The `callback` has 4 parameters:
+
+- `err` - An error that occurred, or `null` on success. The value will be `SteamGuard` if you need to supply an email auth code.
+- `sessionID` - This session's sessionID. Whatever module you're using with this will know what to do with it.
+- `cookies` - An array of session cookies. The format is the same as that returned by [node-steam](https://github.com/seishun/node-steam)'s `webLogOn` method, so anything designed to work with node-steam will also work with this.
+- `steamguard` - If you supplied an email auth code, this will contain your `steamID` and `machineAuth` code, which you should save and provide for subsequent logins.