Merge pull request #985 from ARMmbed/AnotherButler-patch-4

Create bare_metal.md

Author: Amanda Butler

docs/bare_metal.md

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+## Mbed OS bare metal profile
+
+<Add description here>
+
+### Enabling Mbed OS bare metal
+
+To begin using the Mbed OS bare metal profile from Mbed OS 2, please follow our [migration guide](migrating-to-mbed-os-5.html) from Mbed 2 to Mbed 5 and follow the guidelines in the section about [enabling the Mbed OS bare metal profile](migrating-to-mbed-os-5.html#enabling-mbed-os-bare-metal).