Rtos API example

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+Notes:
+- Pull requests will not be accepted until the submitter has agreed to the [contributer agreement](https://github.com/ARMmbed/mbed-os/blob/master/CONTRIBUTING.md).
+- This is just a template, so feel free to use/remove the unnecessary things
+
+## Description
+
+A few sentences describing the overall goals of the pull request's commits.
+
+## Status
+
+**READY/IN DEVELOPMENT/HOLD**
+
+## Migrations
+
+If this PR changes any APIs or behaviors, give a short description of what *API users* should do when this PR is merged.
+
+YES | NO
+
+## Related PRs
+
+List related PRs against other branches:
+
+branch | PR
+------ | ------
+other_pr_production | [link]()
+other_pr_master | [link]()
+
+## Todos
+
+- [ ] Tests
+- [ ] Documentation
+
+## Deploy notes
+
+Notes regarding the deployment of this PR. These should note any required changes in the build environment, tools, compilers and so on.
+
+## Steps to test or reproduce
+
+Outline the steps to test or reproduce the PR here.