Add support for both curl and wget in installation process

[HarryVasanth]

This PR enables installer script to support both curl and wget for downloading Go and addresses the issue where wget is not pre-installed on some Linux distributions:

• Should specify wget requirements. #20

The changes include:

1. Added a new function get_download_command() to detect and use either curl or wget.
2. Modified the find_version_link() function to use the available download command.
3. Updated the install_go() function to handle downloads with either curl or wget.
4. Updated the README.md to reflect the new requirements and remove wget-specific mentions.

_{Closes #20}