Add toolinfo.json
Add toolinfo.json

De facto standard to make the tool indexable by directories like
https://tools.wmflabs.org/hay/directory/

Former-commit-id: cd3e6bde6920ccfbfadec721c245ffbdb63b1afd
eggpi/citationhunt,eggpi/citationhunt,eggpi/citationhunt,guilherme-pg/citationhunt,guilherme-pg/citationhunt,eggpi/citationhunt,guilherme-pg/citationhunt,guilherme-pg/citationhunt