Document Naming Convention standards

[mdebarros]

Its widely accepted that camel case is used as a standard naming convention through-out Mojaloop's code-base, but there are edge scenarios that require further clarification that this PR tries to address.

This PR is to document the naming convention standards used within Mojaloop, and an attempt to also clarify most of the known edge scenarios.

Credit to @vijayg10 for the suggested convention.