Update readme with direct download links

Author: liydu

README.md

@@ -4,17 +4,16 @@ This repository is used to distribute IDE- and board-specific ZIP files
 that you can use in addition to the content in the [getting-started
 repository](https://github.com/azure-rtos/getting-started).
 
-The following ZIP files can be downloaded from the Release associated with
-this repository:
+The following ZIP files can be downloaded from the [release](https://github.com/azure-rtos/samples/releases) associated with this repository or the direct links:
 
-* Azure_RTOS_6.0_ATSAME54-XPRO_IAR_Samples_2020_05_17.zip
-* Azure_RTOS_6.0_ATSAME54-XPRO_MPLab_Samples_2020_05_17.zip
-* Azure_RTOS_6.0_MIMXRT1060_IAR_Samples_2020_05_17.zip
-* Azure_RTOS_6.0_MIMXRT1060_MCUXpresso_Samples_2020_05_17.zip
-* Azure_RTOS_6.0_STM32F746G-DISCO_IAR_Samples_2020_05_17.zip
-* Azure_RTOS_6.0_STM32F746G-DISCO_STM32CubeIDE_Samples_2020_05_17.zip
-* Azure_RTOS_6.0_STM32L475-DISCO_IAR_Samples_2020_05_17.zip
-* Azure_RTOS_6.0_STM32L475-DISCO_STM32CubeIDE_Samples_2020_05_17.zip
+* [Azure_RTOS_6.0_ATSAME54-XPRO_IAR_Samples_2020_05_17.zip](https://github.com/azure-rtos/samples/releases/download/v6.0_rel/Azure_RTOS_6.0_ATSAME54-XPRO_IAR_Samples_2020_05_17.zip)
+* [Azure_RTOS_6.0_ATSAME54-XPRO_MPLab_Samples_2020_05_17.zip](https://github.com/azure-rtos/samples/releases/download/v6.0_rel/Azure_RTOS_6.0_ATSAME54-XPRO_MPLab_Samples_2020_05_17.zip)
+* [Azure_RTOS_6.0_MIMXRT1060_IAR_Samples_2020_05_17.zip](https://github.com/azure-rtos/samples/releases/download/v6.0_rel/Azure_RTOS_6.0_MIMXRT1060_IAR_Samples_2020_05_17.zip)
+* [Azure_RTOS_6.0_MIMXRT1060_MCUXpresso_Samples_2020_05_17.zip](https://github.com/azure-rtos/samples/releases/download/v6.0_rel/Azure_RTOS_6.0_MIMXRT1060_MCUXpresso_Samples_2020_05_17.zip)
+* [Azure_RTOS_6.0_STM32F746G-DISCO_IAR_Samples_2020_05_29.zip](https://github.com/azure-rtos/samples/releases/download/v6.0_rel/Azure_RTOS_6.0_STM32F746G-DISCO_IAR_Samples_2020_05_29.zip)
+* [Azure_RTOS_6.0_STM32F746G-DISCO_STM32CubeIDE_Samples_2020_05_29.zip](https://github.com/azure-rtos/samples/releases/download/v6.0_rel/Azure_RTOS_6.0_STM32F746G-DISCO_STM32CubeIDE_Samples_2020_05_29.zip)
+* [Azure_RTOS_6.0_STM32L475-DISCO_IAR_Samples_2020_05_17.zip](https://github.com/azure-rtos/samples/releases/download/v6.0_rel/Azure_RTOS_6.0_STM32L475-DISCO_IAR_Samples_2020_05_17.zip)
+* [Azure_RTOS_6.0_STM32L475-DISCO_STM32CubeIDE_Samples_2020_05_17.zip](https://github.com/azure-rtos/samples/releases/download/v6.0_rel/Azure_RTOS_6.0_STM32L475-DISCO_STM32CubeIDE_Samples_2020_05_17.zip)
 
 NOTE: These zip files are completely self-contained and include appropriate
 code from the other Azure RTOS repositories. Please refer to the LICENSE.txt file