add 4 decfiles for Xbs and Xcs decays

Mengzhen Wangrequested to merge
mengzhen/Add_DecFiles_For_Xbs_Xcs_Decays into master

Add 4 DecFiles for search of possible tetra-quark particles: Xbs and Xcs.

Xbs: 17145047 and 17145046, with different mass hypothesis and different decay modes.

Xcs: 27164044 and 27104040, with different mass hypothesis and different decay modes.

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