Improve README.md content

[e-psi-lon]

README.md changes:

• Added periods at the end of sentences.
• Added other installation methods.
• Improved word choice for better clarity.
• Fixed information about the update subcommand.
• Added explanations for the commands used in the usage example, along with their outputs.
• Replaced the list of supported package managers with a table and added instructions for suggesting new package managers.
• Corrected capitalization of "Linux" and "Depot" for proper noun usage.
• Updated the license section to include a direct link to the Creative Commons NonCommercial-ShareAlike 4.0 International License.

Other changes:

• Updated artefact name to be full lowercase
• Fixed gitignore to include Cargo.lock file and ignore .idea and .vscode folders

[e-psi-lon]

Problems mentionned before are fixed now