Added aliases page

Aliases.md

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+# Aliases
+Aliases are the easiest way to get some things done in this bot.
+Aliases are essentially a way to bind a command to some specific keyword that you can activate later.
+To use them, load the ``meta`` plugin.
+
+## Syntax
+An alias consists of 2 pieces: the trigger and the command. 
+To create an alias, use the ``alias`` command as follows:
+```
+alias "name" "command to execute"
+```
+After you have created an alias, you can simply activate it by typing it's name.
+
+Example (assuming ``toolbox`` plugin is loaded and your prefix is ``/``):
+```
+/alias "/rules" "/echo ```
+Rules of this server:
+1) Respect each other.
+2) Do not post harmful or violent content.
+3) Be cool.
+```"
+```
+## Arguments
+Sometimes you might want to pass additional arguments to the command inside an alias.
+There are multiple way to do so:
+1. Specify a single argument using a dollar sign (``$``) and the numeric position of the argument
+2. Specify the entire text after the alias using ellipsis
+
+Examples:
+```
+/alias "!speak" "/speak ..."
+```
+When ``!speak`` alias is used, anything after it will be passed to the ``/speak`` command
+
+```
+/alias "!exp" "/calculate $1^2"
+```
+
+When ``!exp`` is used, the first argument (the first piece of text after the command ending with a space or a newline) is passed into the formula ``n^2``, which is then passed to the ``/calculate`` command.