(feat) add credentials configuration

credentials.yml

@@ -0,0 +1,15 @@
+# This only works if you change the env variable in the docker-compose.yml
+credentials:
+  usernames:
+    admin:
+      email: admin@gmail.com
+      name: Admin User
+      logged_in: False
+      password: abc
+cookie:
+  expiry_days: 30
+  key: some_signature_key # Must be string
+  name: some_cookie_name
+pre-authorized:
+  emails:
+  - admin@admin.com