feat: Document Device UART Protocol Properties (#1299)

Signed-off-by: Elizabeth J Lee <elizabeth.j.lee@intel.com>

docs_src/microservices/device/services/device-uart/ProtocolProperties.md

@@ -0,0 +1,21 @@
+---
+title: Device UART - Protocol Properties
+---
+
+# Device UART - Protocol Properties
+
+This service defines the following Protocol Properties for each defined UART device.  These properties reside under the `UART` key in the `protocols` section of each device definition.
+
+| Property       | Description                                                              |
+|----------------|--------------------------------------------------------------------------|
+| deviceLocation | Linux path to the device                                                 |
+| baudRate       | Rate information is transferred (bits/second) |
+
+!!! example - "Example UART Protocol Properties"
+
+    ```yaml
+        protocols:
+          UART:
+            deviceLocation: "/dev/ttyAMA2"
+            baudRate: 115200
+    ```

mkdocs.yml

@@ -228,6 +228,7 @@ nav:
               - Purpose: microservices/device/services/device-uart/Purpose.md
               - Getting Started: microservices/device/services/device-uart/GettingStarted.md
               - Configuration: microservices/device/services/device-uart/Configuration.md
+              - Protocol Properties: microservices/device/services/device-uart/ProtocolProperties.md
               - API Reference: microservices/device/services/device-uart/APIReference.md
               - Source Code: microservices/device/services/device-uart/SourceCode.md
           - Device USB Camera: