PLATFORM and OS or BROWSER: e.g. "local tiles", "webtiles", or "console". Putting this in the labels is also fine. If this is an offline game or an issue with the build process, please include your OS and OS version; if this is an online game please include your browser and version.
DCSS VERSION: e.g. "0.18", ""0.19-a0-1891-ge1d1fe8". If you can launch the game, you can find this information by pressing ?V; the version will be at the top of the screen. If not, check the changelog in the 'docs' directory.
DESCRIPTION: What happened? What went wrong? What else was going on at the time of the problem? Can you reproduce the issue? If you can provide a specific sequence of steps that reproduces the issue, that will be extremely helpful to us (and may also help you in writing the bug report). Screenshots are also very welcome; you should be able to upload these directly to github.
EXTRA FILES: Please include any morgue files, crashlogs, save files here, or extra screenshots here. If this is a crash bug, the crashlog and save file will be extremely helpful; the location of these is sytem-specific but if you ask we can help you find them.
To upload a save file directly to github, compress it to a .zip archive, and then github will accept the upload. (It will not take a .cs file directly.)
If this is an online game, see these instructions for more information on how to make a save backup; you can provide the resulting link here.