Improve README.md Noticeability

[Jaehwa-Noh]

What I have done and why

Highlighted Note in README.md to improve noticeability.
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Note

You should not run ./gradlew test or ./gradlew connectedAndroidTest as this will execute
tests against all build variants which is both unecessary and will result in failures as only the
demoDebug variant is supported. No other variants have any tests (although this might change in future).

Note

The known correct screenshots stored in this repository are recorded on CI using Linux. Other
platforms may (and probably will) generate slightly different images, making the screenshot tests fail.
When working on a non-Linux platform, a workaround to this is to run recordRoborazziDemoDebug on the
main branch before starting work. After making changes, verifyRoborazziDemoDebug will identify only
legitimate changes.

Note

The baseline profile needs to be re-generated for release builds that touch code which changes app startup.

How I'm testing it

Choose at least one:

• Unit tests
• UI tests
• Screenshot tests
• N/A (provide justification)