Demonstrate X-FHIR-Query capabilities

[FikriMilano]

Is your feature request related to a problem? Please describe. There has yet to be a proper demo to showcase X-FHIR-Query capabilities.

Describe the solution you'd like Add X-FHIR-Query demonstration in the demo app.

For example:

1. Have a text field that accepts X-FHIR-Query, user fills in the query, then tap enter
2. The register then show the list of resources that matches the query

Describe alternatives you've considered N/A

Additional context N/A

Would you like to work on the issue? @santosh-pingle or @aditya-07