Added badge for pipeline sample builds.

Author: skarg

README.md

@@ -15,6 +15,9 @@ testing to produce robust C code.
 
 [![Actions Status](https://github.com/bacnet-stack/bacnet-stack-zephyr/actions/workflows/zephyr.yml/badge.svg)](https://github.com/bacnet-stack/bacnet-stack-zephyr/actions/workflows/zephyr.yml) GitHub Workflow: BACnet Stack Zephyr Twister Unit Tests
 
+[![Actions Status](https://github.com/bacnet-stack/bacnet-stack-zephyr/actions/workflows/zephyr-samples.yml/badge.svg)](https://github.com/bacnet-stack/bacnet-stack-zephyr/actions/workflows/zephyr-samples.yml) GitHub Workflow: BACnet Stack Samples Built
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 # What the code does
 
 The Zephyr OS integration offers a collection of samples in the zephyr/samples