Add new-material submission: VBr2

submissions/osc_sub_VBr2_WiktorMatuszek.json

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+{"author": "WiktorMatuszek", "material_id": "1VBr2-1", "osc_id": "OSC-04628", "formula": "Br2V", "method_name": "Organizer-equal QE (pw.x scf/nscf, PSLibrary PAW) + published A_d lookup", "provisional_score": 42.4, "track": "open", "note": "New material outside the active challenge set."}