Using Cloze on the web (cloze.com) you can import contacts from your computer.
Cloze currently supports two importing formats:
1.) Tap on More (...) in the lower left of your screen on cloze.com.
2.) Tap on Settings
3.) Scroll down to the Import / Export section and click on Import to expand the section.
Click on the Add Files button to navigate your prepared file you wish to import.
4.) Then click on the Start Import button to import your contacts.