Added proper config options for PostgreSQL

.env.example

@@ -8,11 +8,18 @@ NODE_ENV=development
 # Put Discord token here
 TOKEN=
 
-# Put database type here
+# Put database type here (mongo or postgres)
 DB=mongo
-# Put MongoDB database URL here
+
+# If you're using MongoDB, put the database URL here
 MONGO=mongodb://localhost:27017/esmBot
 
+# If you're using Postgres, fill in the needed info here
+PG_USER=esmbot
+PG_HOST=localhost
+PG_DB=esmbot
+PG_PORT=5432
+
 # Put snowflake ID of bot owner here
 OWNER=