Updated Identification Codes (markdown)

Identification-Codes.md

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-TODO: Placeholder. Need the link for changelog.
+TODO: Placeholder. Need the link for changelog.
+
+## What
+
+There are two parts to identification codes: The password-like value you enter when connecting, and the resulting 11 character verification code. The former is a secret that you should not share with anybody, and the latter is viewable to everybody as proof that you know the former.
+
+## Why
+
+Using an identification code makes it more difficult for somebody else to impersonate you.
+
+## How
+
+The log in page has a new field for an identification code. You are not required to provide one. This is an 8 to 100 character value that allows any special characters. It should be easy to remember, but difficult to guess, and **should not** be the same as the password you use anywhere else. The value you enter is never stored anywhere, and is only used to generate the 11 character verification code.
+
+This identification code is combined with your username and a server secret to generate an 11-character verification code. Other users can see this verification code by hovering their mouse cursor over your messages in chat, or issuing the ```/whois``` command against your username.
+
+Users that have an identification code have their username prefixed with a plus sign (+) in chat. Administrators have their username prefixed with an at sign (@) in chat.
+
+Note that if you change your username, your verification code will change even if you use the same identification code. The username and identification code are both case-sensitive to changes in the verification code.