Add documentation for Runner/../USBHost/run.sh

Added setup information and basic requirements.
This informs the tester of the hardware setup requirement before
starting test.

Signed-off-by: Aanchal Chaurasia <[email protected]>

Author: achauras-qcom

Runner/suites/Kernel/FunctionalArea/baseport/USBHost/README.md

@@ -0,0 +1,27 @@
+```
+Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
+SPDX-License-Identifier: BSD-3-Clause-Clear
+```
+
+# USB Host Mode Validation
+
+## Overview
+
+This shell script executes on the DUT (Device-Under-Test) and verifies enumeration of connected USB devices.
+
+---
+
+## Setup
+
+- Connect USB peripheral(s) to USB port(s) on DUT.
+- Only applicable for USB ports that support Host Mode functionality. 
+- USB peripherals examples: Mass Storage devices (pendrives, SSD, hard drives, etc.), HID devices (Mouse, Keyboard, USB headset, USB camera, etc.) 
+
+---
+
+## License
+
+```
+Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.  
+SPDX-License-Identifier: BSD-3-Clause-Clear
+```