database-prod.default.properties: Add header info (usage)

Signed-off-by: Pekka Helenius <fincer89@hotmail.com>

bookstore/src/main/resources/database-prod.default.properties

@@ -1,3 +1,11 @@
+# Pekka Helenius <fincer89@hotmail.com>, Fjordtek 2020
+
+# NOTE
+# This is a default template file for production environment database connections
+# To use this file in your bookstore deployment, rename the file
+# to database-prod.properties and fill in your database connection details below.
+
+
 # Persistent database
 spring.datasource.driver-class-name   = com.mysql.cj.jdbc.Driver
 spring.datasource.url                 = jdbc:mysql://127.0.0.1:3306/<DB_DATABASE_NAME>?useUnicode=true&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC