add figure to MultipleSequenceAlignment assay

assays/MultipleSequenceAlignment/README.md

+<img src=dataset\gr4a_lrg.jpg width=100%>
+
+### Figure 4 A) caption
+
+**Figure 4 A).**  Multiple sequence alignment with sequences from different domains of life indicates conservation of nucleophilic glutamate residues (red letters) within the catalytic domain (yellow box).
+
+### Figure 4 A) source
+https://www.cell.com/current-biology/fulltext/S0960-9822(23)01449-5?_returnURL=https%3A%2F%2Flinkinghub.elsevier.com%2Fretrieve%2Fpii%2FS0960982223014495%3Fshowall%3Dtrue#fx1
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