Bug tracking with Git

[kamocat]

I'm planning on using TortoiseGit with my programmers this year. I would have used Git last year, but I decided that they would take a long time learning how to use the command line interface. (It's not very intuitive)
So this year I'm planning on doing it with TortoiseGit.

I've never used bug tracking, but the revision control seems like it's missing something without that. Here's what I need:

• Graphical interface (no command line neccessary)
• Distributed (internet access need not be immidiately available)
• Free
• Easy to install (doesn't need to be compiled for Windows)

Here's what I'd like in addition to that:

• No dependent packages (that aren't inclided with the installer)
• Integrates with TortoiseGit

I've searched a bit, and found that most options don't meet my first four requirements, and I'm pretty sure there's no existing software that meets all of them.

Really, I don't need anything that's terribly complex. Perhaps the best (and easiest) method is just to make text documents in the appropriate folders. I'm not sure it would really matter if the documents had a standard naming format - they could be called ReadMe.txt or Notes.txt or Features.txt - they would still document intended features, and current bugs with those features, and they would be associated with the commits by the nature of revision control itself.

What would you suggest?