Simple Ranging example, using Polling, with Expansion Board and Satellite Boards.

Dependencies:   X_NUCLEO_53L1A1_mbed

Revision:
0:6b7696e7df5e
diff -r 000000000000 -r 6b7696e7df5e CONTRIBUTING.md
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+# Contributing to Mbed OS
+
+Mbed OS is an open-source, device software platform for the Internet of Things. Contributions are an important part of the platform, and our goal is to make it as simple as possible to become a contributor.
+
+To encourage productive collaboration, as well as robust, consistent and maintainable code, we have a set of guidelines for [contributing to Mbed OS](https://os.mbed.com/docs/mbed-os/latest/contributing/index.html).