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>

.remarkrc

@@ -0,0 +1,5 @@
+{
+  "plugins": [
+    "preset-lint-markdown-style-guide"
+  ]
+}