Added limit and sort parameters, post index variable and relevant usage documentation.

README.md

@@ -6,6 +6,10 @@
 ## Usage
 `node app.js --user={username}`
 
+### Optional parameters
+* `--limit={number}`: Maximum amount posts to fetch content from
+* `--sort={method}`: How posts should be sorted while fetched. This affects the `$postIndex` variable, and in combination with a `--limit` decides what posts will be included
+
 ## Configuration
 The default configuration aims to be sensible, and the application may be used without any further tweaking. However, this application came to life because I was not satisfied by the organizatory facilities of similar applications, thus a multitude of options are at your disposal as described in this document.
 
@@ -17,12 +21,11 @@ Path patterns dictate where and how a file will be saved. Various variables and
 * `$postTitle`: The title of the reddit post
 * `$postUser`: The user that submitted the post, almost always equivalent to the `--user` command line argument
 * `$postDate`: The submission date of the reddit post, formatted by the `dateformat` configuration described below
-
+* `$postIndex`: The index of the post according to the sort method
 * `$albumId`: The ID of the media host album
 * `$albumTitle`: The title of the media host album
 * `$albumDescription`: The description of the media host album
 * `$albumDate`: The submission date of the media host album, formatted by the `dateformat` configuration described below
-
 * `$itemId`: The ID of the individual image or video
 * `$itemTitle`: The title of the individual image or video
 * `$itemDescription`: The description of the individual image or video