chore: Create README.md

Author: kakopappa

examples/Relay/README.md

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+# Tutorials
+1. [Switch Tutorial: Part 1 - How to turn on and off a Relay](https://help.sinric.pro/pages/tutorials/switch/part-1)
+2. [Switch Tutorial: Part 2 - Add a push button to toggle the Relay](https://help.sinric.pro/pages/tutorials/switch/part-2)
+3. [Switch Tutorial: Part 3 - Multiple relays with multiple tactile (push) buttons](https://help.sinric.pro/pages/tutorials/switch/part-3)