add .gitignore

1 job for master in 11 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
failed #40033
tests

00:00:11

 
Name Stage Failure
failed
tests Test
\progressbar@progressbar ...ressbar@tmpdim by 128 
\begin {tikzpicture} \draw...
l.22 }

! ==> Fatal error occurred, no output PDF file produced!
Transcript written on many-pages.log.
Makefile:27: recipe for target 'pdflatex/many-pages' failed
make: *** [pdflatex/many-pages] Error 1
ERROR: Job failed: exit code 1