Add instructions for setting it up with MySQL/MariaDB, add updating Django to an idea for README.foreskin, add requirements.txt and update README to use it

closedverse/settings.py

@@ -99,6 +99,18 @@ DATABASES = {
         'NAME': os.path.join(BASE_DIR, 'sql.sqlite3'),
     }
 }
+# Uncomment the below and comment the above DATABASES to use MySQL instead of SQLite.
+#DATABASES = {
+#    'default': {
+#        'ENGINE': 'django.db.backends.mysql',
+#        'NAME': 'database-name',
+#        'USER': 'username',
+#       'PASSWORD': 'user-password',
+#        'HOST': '127.0.0.1',
+#        'PORT': '3306',
+#    }
+#}
+
 
 # Password validation
 # https://docs.djangoproject.com/en/2.2/ref/settings/#auth-password-validators