Add documentation

Author: Ross Solomon

docs/rules/jsx-closing-tag-location.md

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+# Validate closing tag location in JSX (react/jsx-closing-tag-location)
+
+Enforce the closing tag location for multiline JSX elements.
+
+**Fixable:** This rule is automatically fixable using the `--fix` flag on the command line.
+
+## Rule Details
+
+This rule checks all JSX multiline elements with children (non-self-closing) and verifies the location of the closing tag. The expectation is that the closing tag is aligned with the opening tag on its own line.
+
+The following patterns are considered warnings:
+
+```jsx
+<Hello>
+  marklar
+  </Hello>
+```
+
+```jsx
+<Hello>
+  marklar</Hello>
+```
+
+The following are not considered warnings:
+
+```jsx
+<Hello>
+  marklar
+</Hello>
+```
+
+```jsx
+<Hello>marklar</Hello>
+```
+
+## When not to use
+
+If you do not care about closing tag JSX alignment then you can disable this rule.