Clarify JAVA_HOME and PATH setup in README

[chiranjib-swain]

Description:
This pull request updates the documentation in the README.md file to clarify how to set up a specific Java version when multiple JDKs are installed.

• README.md: Added instructions for updating the JAVA_HOME environment variable and prepending the desired JDK's bin directory to the PATH to prioritize a specific Java version.

Related issue:
#835

Check list:

• Mark if documentation changes are required.
• Mark if tests were added or updated to cover the changes.

[Copilot]

Pull Request Overview

This PR enhances the README with explicit steps to prioritize a specific JDK by configuring JAVA_HOME and updating PATH.

• Adds guidance on updating the JAVA_HOME environment variable and prepending its bin directory to PATH for version precedence.

[Copilot]

[nitpick] Consider wrapping environment variables like JAVA_HOME and PATH in code formatting for consistency, and include example shell commands (e.g., export JAVA_HOME=/path/to/jdk; export PATH="$JAVA_HOME/bin:$PATH") to make the instructions more actionable.

Suggested change

	All versions are added to the PATH. The last version will be used and available globally. Other Java versions can be accessed through env variables with such specification as 'JAVA_HOME_{{ MAJOR_VERSION }}_{{ ARCHITECTURE }}'. To set up a specific Java version, update the JAVA_HOME environment variable and prepend its bin directory to the PATH to ensure the desired JDK takes priority during execution.
	All versions are added to the `PATH`. The last version will be used and available globally. Other Java versions can be accessed through environment variables with such specification as `JAVA_HOME_{{ MAJOR_VERSION }}_{{ ARCHITECTURE }}`. To set up a specific Java version, update the `JAVA_HOME` environment variable and prepend its `bin` directory to the `PATH` to ensure the desired JDK takes priority during execution. For example:
	```sh
	export JAVA_HOME=/path/to/specific/jdk
	export PATH="$JAVA_HOME/bin:$PATH"

[mahabaleshwars]

The term “last version” could be clarified (e.g., “the last one added to the PATH”).