Add kernel of a README.md + add mbed-os/master CircleCI badge

PrzemekWirkus · PrzemekWirkus · commit fdcf9b844497 · 2016-06-02T13:37:15.000+01:00
diff --git a/README.md b/README.md
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+[![CircleCI](https://circleci.com/gh/ARMmbed/mbed-os.svg?style=svg)](https://circleci.com/gh/ARMmbed/mbed-os)
+
+---
+
+# mbed-os

-Original file line number
+Diff line change
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 +[![CircleCI](https://circleci.com/gh/ARMmbed/mbed-os.svg?style=svg)](https://circleci.com/gh/ARMmbed/mbed-os)
++
 +---
++
 +# mbed-os