Add Gorontalo Wikipedia (gorwiki) welcome template to welcome.py
Add Gorontalo Wikipedia (gorwiki) welcome template to welcome.py

Bug: T220315
Change-Id: Id3c091f913c2f67ab2754c60b3a04553cf44b36d

PersianWikipedia/pywikibot-core,wikimedia/pywikibot-core,wikimedia/pywikibot-core