FEATURE: Added arduino CLI support

software/clock_setup_using_arduino_code/README.md

@@ -1,17 +1,11 @@
 # How to setup and upload code
 
-To flash the firmware for configuring the PLL chip to compatible MCUs we will be using [Arduino-CLI](https://github.com/arduino/arduino-cli).
+To flash the firmware for configuring the PLL chip to compatible MCUs we will be using the [Arduino-CLI](https://github.com/arduino/arduino-cli).
 
 ## Procedure
 
 ### Prerequisite
 
-- Add the following line in your `.bashrc` or `.zshrc`.
-```bash
-export PATH=$HOME/arduino_cli/bin:$PATH
-```
-- Make sure to source your `.bashrc` or `.zshrc` after updating `$PATH`.
-
 - Install `libhidapi-hidraw0` library for USB serial communication.
 ```bash
 # Ubuntu/Debian
@@ -20,9 +14,33 @@ sudo apt install libhidapi-hidraw0
 ```
 
 ### Install Arduino CLI
-- Move to directory `./software/clock_setup_using_arduino_code` which contains
-the Makefile required for setup, compilation and uploading the sketch.
-- Run `make setup-arduino-cli` which will install `arduino-cli`.
+- Move to directory `./software/clock_setup_using_arduino_code` which contains the Makefile required for setup, compilation and uploading the sketch.
+```bash
+# install Arduino CLI
+
+# NOTE: the CLI will be installed in the $PATH_INSTALL provided.
+# Default path: ~/arduino_cli
+
+make setup-arduino-cli PATH_INSTALL=<installation_path>
+```
+- Once installation is complete add the following line in your `.bashrc` or `.zshrc` to update the `$PATH` variable.
+```bash
+# When using custom install path
+export PATH=<installation_path>/bin:$PATH
+
+# When using default install path 
+export PATH=$HOME/arduino_cli/bin:$PATH
+```
+- Source your `.bashrc` or `.zshrc` after updating `$PATH`.
+- Verify your installation.
+
+```bash
+# arduino CLI installation path
+which arduino-cli
+
+# arduino CLI installed version
+arduino-cli version
+```
 
 ### Install Board Files
 - Now we need to setup and add the board support files for our CH32 EVT chips which can be found [here](https://github.com/openwch/arduino_core_ch32).
@@ -34,7 +52,7 @@ the Makefile required for setup, compilation and uploading the sketch.
   # show all connected boards/chips via USB
   make list-boards
   ```
-- Make sure to check if Port value e.g. `/dev/ttyACM0` is the same as in the `Makefile`. If not, update it accordingly.
+- Make sure to check if the port e.g. `/dev/ttyACM0` is the same as in the `Makefile`. If not, update it accordingly.
 - To compile the sketch run:
   ```bash
   make compile