Resolve "Add provision for external database in 3.31 version"

Resolves #4 (closed)

Provide an example of utilizing an external database. I was able to confirm a freshly installed NXRM instance was able to properly function with a AWS RDS instance.

Unfortunately, the generation of a random password is not appropriately set in the database. I had to follow the documentation here to create the initial admin username and password. After successfully logging in as the admin user, the .Values.custom_admin_password value may be populated to properly account for Jobs (ie saml, proxy, blobstore).