Add new-material submission: VI3

submissions/osc_sub_VI3_WiktorMatuszek.json

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+{"author": "WiktorMatuszek", "material_id": "2VI3-1", "osc_id": "OSC-02106", "formula": "I6V2", "method_name": "Organizer-equal QE (pw.x scf/nscf, PSLibrary PAW) + published A_d lookup", "provisional_score": 34.0, "track": "open", "note": "New material outside the active challenge set."}