Add a function that registers your nick, if your bot uses one

[shaunagm]

In order to implement this, we'll probably need to add:

• a variable or flag in the code that indicates whether or not the bot should try to identify
• a function that sends a message to the network identifying using this syntax

To keep the password private, you'll probably want the password to be read in from a separate file, for example "bot_password.txt", that is outside the repository or is gitignored.