add figure to FungalColonization assay

assays/FungalMaterialGrowthConditionsAndBarleyColonizationAssays/README.md

+<img src=dataset\gr6b_lrg.jpg width=60%>
+
+### Figure 6 B) caption
+
+**Figure 6 B).** Schematic representation of different forms of CWAs in barley roots in response to fungal colonization. These include papillae formation at the sites of attempted (1) and successful (2) hyphal penetration, as well as an extensive reaction along the CWs (3).
+
+### Figure 6 B) 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
+
 <img src=dataset\FigS3B.jpg width=60%>
 
 ### Supplementary Figure 3 B) caption