add common exclusions for jetty developers

[jmcc0nn3ll]

as per title

[mojavelinux]

I still would prefer all paths to be rooted. That ensures that the exclusions only match in expected places and not any depth. A rooted path is one that begins with /. The / references the root of the git repository (not an absolute path on the filesystem).

If there is a separator at the beginning of the pattern, then the pattern is relative to the directory level of the particular .gitignore file itself.

See https://git-scm.com/docs/gitignore#_pattern_format

[mojavelinux]

The following entry is a good case of when you want an unrooted path:

.DS_Store/

(note the trailing slash, though)

That's because this folder can (and likely will) occur anywhere.

[joakime]

Do we have a sane .gitattributes too?

(and no, all of the auto eol tricks that git does are broken, and have remained broken for years)

[mojavelinux]

Here's what I tend to use for .gitattributes (with more diff settings if they apply for the project)

* text=auto eol=lf
*.css diff=css