Lifekee: contact address book

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1. New option to access digital business card QR code to connect with other Lifekee users
2. Now you can search for businesses and promotions in other locations! Just change the country in the search bar to see them.
3. Add a note when sending a connection request for a better response rate.
4. Introduce two contacts on Lifekee. Great feature for networking!
5. Bug fixes and minor improvements