added link to django-admin-tools docs in README
added link to django-admin-tools docs in README

nwaxiomatic/django-wpadmin,vstoykov/django-wpadmin,vstoykov/django-wpadmin,barszczmm/django-wpadmin,barszczmm/django-wpadmin,vstoykov/django-wpadmin,barszczmm/django-wpadmin,nwaxiomatic/django-wpadmin,barszczmm/django-wpadmin,nwaxiomatic/django-wpadmin,nwaxiomatic/django-wpadmin