Add basic usage help.

[mishaturnbull]

Finally, some documentation.

List of all features that need to be doc'd:

• [x] Configuration
  • [x] # emails
  • [x] Basic email config (subject, text, to, from)
  • [x] Server (address, ports, common config's)
  • [x] From tag forge
• [x] Sending
  • [x] Send button location
  • [x] Abort/reset usage & progress bar

[mishaturnbull]

Merge to push basic documentation live. Will continue to improve docs on this branch and repeat the merge process.