Create example branches

[locphan87]

It's better to experience code conventions, principles and real-world features in action. An example needs to cover one/some of these concerns:

• build a typical module
• use GraphQL queries & mutations
• allow toggling the language
• support multiple navigation stacks
• define UI (styled) components
• handle forms & validation rules
• use feature flags
• define and use environment variables
• write type-safe code
• set up a crashing report service
• write an effective selector
• ...
• You name it