Create README.md

Amanda Butler · web-flow · commit 43f2e80f0580 · 2019-04-05T11:34:24.000-05:00
Add README for consistency and better UX.
diff --git a/DeviceKey/README.md b/DeviceKey/README.md
@@ -0,0 +1 @@
+To see this example in context, please see its [published documentation](https://os.mbed.com/docs/mbed-os/latest/apis/devicekey.html#devicekey-example).

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	`1`	`+To see this example in context, please see its [published documentation](https://os.mbed.com/docs/mbed-os/latest/apis/devicekey.html#devicekey-example).`