Add a small section on how to run markdownlint locally (#938)

* add a small section on how to run markdownlint locally * uppercase
open-telemetry · Jul 28, 2020 · b25d741 · b25d741
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commit b25d741
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diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -84,6 +84,13 @@ Run tests:
 dotnet test
 ```
 
+If you made changes to the Markdown documents (`*.md` files), install the latest
+[`markdownlint-cli`](https:/igorshubovych/markdownlint-cli) and run:
+
+```sh
+markdownlint .
+```
+
 Check out a new branch, make modifications and push the branch to your fork:
 
 ```sh