add page for E023

E023.md

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+# E023
+## `.panel-body` must have a `.panel` or `.panel-collapse` parent
+
+A `.panel-body` must be a direct child of its `.panel` or `.panel-collapse`. No levels of intervening elements are permitted between the `.panel-body` and the `.panel` or `.panel-collapse`.
+
+Wrong:
+```html
+<div class="panel panel-default">
+  <div class="my-super-special-wrapper">
+    <div class="panel-body">
+      Basic panel example
+    </div>
+  </div>
+</div>
+```
+
+Right:
+```html
+<div class="panel panel-default">
+  <div class="panel-body">
+    Basic panel example
+  </div>
+</div>
+```