add sample env file for credentials

env.sample

@@ -0,0 +1,26 @@
+
+# PostgreSQL role for the database
+POSTGRES_USER=transportation2019
+
+# PostgreSQL database name
+POSTGRES_NAME=transit_operations_analytics_data
+
+# PostgreSQL host
+POSTGRES_HOST=local_postgis
+
+# PostgreSQL password. With a local PostGIS container,
+# this password will be used for both `postgres` and
+# `${POSTGRES_USER}`
+POSTGRES_PASSWORD=this_is_not_the_password
+
+# standard PostgreSQL port
+POSTGRES_PORT=5432
+
+# Django variables
+DJANGO_SECRET_KEY=h0ldon2th3nighT
+DEBUG=true
+
+# pgAdmin4 container credentials - use these
+# to log in to `http://localhost:8686`
+PGADMIN_DEFAULT_EMAIL=ed.borasky@hackoregon.org
+PGADMIN_DEFAULT_PASSWORD=yet_another_feeble_attempt