Update thoeris.md

#273 (closed) issue We added Description and Mechanism of Action + checked everything

Crystal structure to add: The atomic coordinates and structure factors for ThsA and ThsB were deposited in the Protein Data Bank50 with the accession codes 6LHX [10.2210/pdb6LHX/pdb] and 6LHY [10.2210/pdb6LHY/pdb], respectively.