doc: add a markdown linting configuration file

Add a markdown linting configuration file. The configuration file is using [remark-preset-lint-markdown-style-guide](https://github.com/remarkjs/remark-lint/tree/master/packages/remark-preset-lint-markdown-style-guide). This preset configure `remark-lint` with settings that the [Markdown Style Guide](http://www.cirosantilli.com/markdown-style-guide/) recommends.

Signed-off-by: oupala <oupala@users.noreply.github.com>

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