Update README.md

[Reagankm]

Requirements for Contributing a Performance Improvement

• Fill out the template below. Any pull request that does not include enough information to be reviewed in a timely manner may be closed at the maintainers' discretion.
• The pull request must only affect performance of existing functionality. To contribute other changes, you must use a different template.
• After you create the pull request, all status checks must be pass before a maintainer reviews your contribution.

Description of the Change

(This was the closest template I could find.)

Updated the README to include two requirements that are needed for the package to work.

I attempted to install and use this package but got an error about not having gesture-handler, which went away after I installed it, but then I got the error "Unable to resolve module expo-modules-core".

Quantitative Performance Benefits

Gives users info about additional installation requirements

Possible Drawbacks

None

Verification Process

N/A

Applicable Issues

NA

Release Notes

Added additional requirements to installation instructions in README.