Add configuration management using viper

Add a write through caching layer with the database layer. Dependent on #1 being done.

Healthcheck module should check the functionality of the app on an independent schedule.
Healthcheck endpoint should show the last result from the healthcheck module.

Add battle.net oauth to allow hello world to reference the users default character.

Add database functionality. It should:

Make sure there is an interface between the database and the rest of the codebase.

Use the Gin framework to handle http.

https://github.com/gin-gonic/gin

Add a terraform directory and necessary TF code to run docker container in a cloud.