Add CI

1 job for master in 5 minutes and 3 seconds (queued for 1 second)
Name Stage Failure
PDF Test
242093e..46c9d2e master -> origin/master
Checking out 46c9d2ea as master...
Skipping Git submodules setup
$ pandoc -f md -t pdf docs/ -o constituion.pdf
pandoc: Unknown writer: pdf
To create a pdf with pandoc, use the latex or beamer writer and specify
an output file with .pdf extension (pandoc -t latex -o filename.pdf).
ERROR: Job failed: exit code 1