Add documentation for pre-commit

docs/index.rst

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    disable_with_comments
    development
    text_editors
+   integration

docs/integration.rst

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+Integration with other software
+===============================
+
+Integration with pre-commit
+---------------------------
+
+You can integrate yamllint in `pre-commit <http://pre-commit.com/>`_ tool.
+Here is an example, to add in your .pre-commit-config.yaml
+
+.. code:: yaml
+
+  # Update the sha variable with the release version that you want, from the yamllint repo
+  - repo: https://github.com/adrienverge/yamllint.git
+    sha: v1.8.1
+    hooks:
+      - id: yamllint