README: Add instructions for Mbed CLI 2

Mbed CLI 2 is the recommended build tool moving forward. Add directions
on how to build this example with Mbed CLI 2.

Author: LDong-Arm

README.md

@@ -5,12 +5,22 @@ This example demonstrates how Mbed OS crash reporting works on an Mbed OS Enable
 
 You can find more information about the crash reporting APIs in the [documentation](https://os.mbed.com/docs/mbed-os/latest/apis/error-handling.html#crash-reporting-and-auto-reboot).
 
-You can build this project with all supported [Mbed OS build tools](https://os.mbed.com/docs/mbed-os/latest/tools/index.html). However, this example project specifically refers to the command-line interface tool [Arm Mbed CLI](https://github.com/ARMmbed/mbed-cli#installing-mbed-cli).
+You can build the project with all supported [Mbed OS build tools](https://os.mbed.com/docs/mbed-os/latest/tools/index.html). However, this example project specifically refers to the command-line interface tools, [Arm Mbed CLI 1](https://github.com/ARMmbed/mbed-cli#installing-mbed-cli) and [Mbed CLI 2](https://github.com/ARMmbed/mbed-tools#installation).
 
-1. Install Mbed CLI.
+## Mbed OS build tools
+
+### Mbed CLI 2
+Starting with version 6.5, Mbed OS uses Mbed CLI 2. It uses Ninja as a build system, and CMake to generate the build environment and manage the build process in a compiler-independent manner. If you are working with Mbed OS version prior to 6.5 then check the section [Mbed CLI 1](#mbed-cli-1).
+1. [Install Mbed CLI 2](https://os.mbed.com/docs/mbed-os/latest/build-tools/install-or-upgrade.html).
+1. From the command-line, import the example: `mbed-tools import mbed-os-example-crash-reporting`
+1. Change the current directory to where the project was imported.
+
+### Mbed CLI 1
+1. [Install Mbed CLI 1](https://os.mbed.com/docs/mbed-os/latest/quick-start/offline-with-mbed-cli.html).
 1. From the command-line, import the example: `mbed import mbed-os-example-crash-reporting`
 1. Change the current directory to where the project was imported.
 
+
 ## Application functionality
 
 This example demonstrates the Mbed OS crash reporting feature and the APIs associated with it. In the first run, the application generates a fault that causes the system to reboot. In the second run, the application detects that the reboot was caused by an error and prints the fault context information in the console.
@@ -45,23 +55,46 @@ Second run:
 1. Connect a USB cable between the USB port on the target and the host computer.
 1. Run this command to build the example project and program the microcontroller flash memory:
 
+    * Mbed CLI 2
+
+    ```bash
+    $ mbed-tools compile -m <TARGET> -t <TOOLCHAIN> --flash
+    ```
+
+    * Mbed CLI 1
+
     ```bash
-    $ mbed compile -m <TARGET> -t <TOOLCHAIN> --flash --sterm
+    $ mbed compile -m <TARGET> -t <TOOLCHAIN> --flash
     ```
 
-(Note: You can use the Mbed CLI command-line option "--sterm" to open a serial terminal after flashing.)
+(Note: You can use the Mbed CLI command-line option `--sterm` to open a serial terminal after flashing.)
 
 Your PC may take a few minutes to compile your code.
 
-The binary is located at `./BUILD/<TARGET>/<TOOLCHAIN>/mbed-os-example-crash-reporting.bin`.
+The binary is located at:
 
-Alternatively, you can manually copy the binary to the target, which gets mounted on the host computer through USB.
+* **Mbed CLI 2** -
+  `./cmake_build/<TARGET>/develop/<TOOLCHAIN>/mbed-os-example-crash-reporting.bin`
 
-Depending on the target, you can build the example project with the `GCC_ARM`, `ARM` or `IAR` toolchain. After installing Arm Mbed CLI, run the command below to determine which toolchain supports your target:
+* **Mbed CLI 1** - `./BUILD/<TARGET>/<TOOLCHAIN>/mbed-os-example-crash-reporting.bin`.
 
-```bash
-$ mbed compile -S
-```
+You can manually copy the binary to the target, which gets mounted on the host
+computer through USB, rather than using the `--flash` option.
+
+You can also open a serial terminal separately, rather than using the `--sterm`
+option, with the following command:
+
+* Mbed CLI 2
+    ```bash
+    $ mbed-tools sterm
+    ```
+
+* Mbed CLI 1
+    ```bash
+    $ mbed sterm
+    ```
+
+Depending on the target, you can build the example project with the `GCC_ARM` or `ARM` toolchain.
 
 ## Expected output