Investigate if FHIR library can request users to enter screen lock challenge

[stevenckngaa]

Describe the issue to be researched
Include any background information and available resources.
This PR introduced sqlcipher to encrypt FHIR resources database. To further secure devices using apps built upon FHIR SDK, we should

• [P0] at least require the user to setup a lock screen.
• [P1] on request, the user must enter a screen lock challenge before they can access the encryption key.

Describe the goal of the research
What's the desired outcome of this task? What artifacts should be produced?
Enumerate ways to request users to enter screen lock challenge before using our app / database encryption key.

Describe the methodology
Where can more information be found? Who should the assignee approach to ask questions? How can a decision be made?
TBD

Would you like to work on the issue?
Yes

[jingtang10]

please also see #76 - can you merge these two issues?

[stevenckngaa]

Thanks Jing. Didn't know there is already an existing issue. I have closed this and assigned #76 to myself.