inital commit for signup

added a basic app using the UserCreationForm to create new user at /accounts/signup/
change outside of the app are:
-added signup to INSTALLED_APPS in /photo21/settings.py
-added accounts/signup/ to path in /photo21/urls.py

should extend UserCreationForm to have field for email and maybe first/last names, except if we want the user to add that themselves later

photo21/settings.py

@@ -43,6 +43,7 @@ INSTALLED_APPS = [
     'django.contrib.staticfiles',
     'photologue_custom',
     'photologue',
+    'signup',
     'sortedm2m',
     'taggit',
 ]

photo21/urls.py

@@ -30,6 +30,7 @@ urlpatterns = [
     path('i18n/', include('django.conf.urls.i18n')),
     path('admin/', admin.site.urls),
     path('admin/doc/', include('django.contrib.admindocs.urls')),
+    path('accounts/signup/', include('signup.urls'))
 ]
 
 if settings.DEBUG: