Add expo-secure-store to a list of libraries to consider for secure storage

[sjchmiela]

Noticed this great page and thought expo-secure-store, using keychain services on iOS and SharedPreferences and Keystore on Android, is worth mentioning too. 🙂

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[sjchmiela]

CLA signed! ✅

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[Simek]

expo-secure-store looks like a good addition to the list, thank you! 👍