ISTWCMS-5717: adding yml for exp/col

src/patterns/04-components/exp_col_block/exp_col_block.yml

+exp_col:
+  heading_selector: 'h2'
+  uuid: '092q5780923480932846928'
+  show_exp_col_all: true
+  items:
+    -
+      heading_text: 'Exp/Col 1'
+      content: '<p>Exp/Col 1 Content'
+    -
+      heading_text: 'Exp/Col 2'
+      content: '<p>Exp/Col 2 Content'
+    -
+      heading_text: 'Exp/Col 3'
+      content: '<p>Exp/Col 3 Content'
+    -
+      heading_text: 'Exp/Col 4'
+      content: '<p>Exp/Col 4 Content'
+    -
+      heading_text: 'Exp/Col 5'
+      content: '<p>Exp/Col 5 Content'