Discovery: add Pd2S2 (2PdS-4)

active_challenge.csv

@@ -598,3 +598,4 @@ OSC-00777,2PPdS3-1,2PPdS3-1,P2Pd2S6,discovery,light,,ok,0.06579,0.52632,8.0,-0.7
 OSC-00778,2PPdSe3-1,2PPdSe3-1,P2Pd2Se6,discovery,light,,ok,0.06043,0.48344,8.0,-0.4129,1.6632,,0.6667,0.54921,gaussian_dos_scf_mesh,0.00483,,
 OSC-00780,1TaSi2P4-1,1TaSi2P4-1,P4Si2Ta,discovery,light,,ok,0.18133,1.45064,8.0,-0.2583,0.9947,,0.0,0.32338,gaussian_dos_scf_mesh,0.03844,,
 OSC-00781,2PdTaS5-1,2PdTaS5-1,Pd2S10Ta2,discovery,light,,ok,0.19837,1.58696,8.0,-3.4443,0.6558,,0.3333,0.31846,gaussian_dos_scf_mesh,0.04299,,
+OSC-00782,2PdS-4,2PdS-4,Pd2S2,discovery,light,,ok,0.21448,1.71584,8.0,-0.3504,0.9595,,0.0556,0.74655,gaussian_dos_scf_mesh,0.04523,,