Add guide for soju IRC bouncer.

[apoxa]

Closes #1218.

[noave]

thanks :) I added some minor comments and would test the guide afterwards

[noave]

Unfortunately I could not successfully run the build:

[noaguide@perseus soju]$ PREFIX="/.local" DESTDIR="$HOME" make install
mkdir -p /home/noaguide/.local/bin
mkdir -p /home/noaguide/.local/share/man/man1
mkdir -p /home/noaguide/etc/soju
mkdir -p /home/noaguide/var/lib/soju
cp -f soju sojuctl /home/noaguide/.local/bin
cp -f doc/soju.1 /home/noaguide/.local/share/man/man1
cp: cannot stat ‘doc/soju.1’: No such file or directory
make: *** [Makefile:26: install] Error 1

[luto]

Thanks for your guide! We would like to keep the list of open pull requests clean to improve the overview. Since this has been dormant for a few months, I'm closing this now. Once you find time to look at the failing build, feel free to submit it again.