Updated README with reference to actions and samples.

Author: skarg

README.md

@@ -1,11 +1,36 @@
 # bacnet-stack-zephyr
 
-[Zephyr OS](https://zephyrproject.org/) integration of BACnet Stack
+BACnet open source protocol for embedded systems
+using [Zephyr OS](https://zephyrproject.org/) integrated with BACnet Stack
 C library hosted on Sourceforge and Github sites.
 
 * [Github](https://github.com/bacnet-stack/bacnet-stack)
 * [Sourceforge](https://bacnet.sourceforge.net/)
 
+# Continuous Integration
+
+This integration uses automated continuous integration services to assist in automated compilation, validation, linting, security scanning, and unit testing to produce robust C code.
+
+[![Actions Status](https://github.com/bacnet-stack/bacnet-stack/workflows/CMake/badge.svg)](https://github.com/bacnet-stack/bacnet-stack/actions/workflows/zephyr.yml) GitHub Workflow: BACnet Stack Zephyr Twister Unit Tests
+
+# What the code does
+
+The Zephyr OS integration offers a collection of samples in the zephyr/samples
+folder that highlight the features of this BACnet integration, include some
+BACnet Basic objects and services that can be used to quickly create a BACnet
+device on a variety of existing boards.
+
+These samples are crafted to be simple and easy to understand, serving as a starting point for your own projects.
+
+## Hello BACnet Stack
+
+A simple "Hello World" sample that can be used with any supported board boards and prints ["Hello BACnet-Stack"](./zephyr/samples/hello_bacnet_stack/README.rst) to the console.
+
+## BACnet Application Profile Simple Sensor (B-SS)
+
+A device application demonstrating configuration of a
+[BACnet B-SS (simple sensor) device profile](./zephyr/samples/profiles/b-ss/README.rst) that can be used with any supported board boards.
+
 # Coding Style and Guidelines
 
 See Zephyr Project [Coding Guidelines](https://docs.zephyrproject.org/latest/contribute/coding_guidelines/index.html)