Update Tauri version in README example

Bumped the Tauri dependency version in the README's Cargo.toml example from 2.5.1 to 2.9.4 to reflect the latest recommended version.

Bump tauri-plugin-cache to version 0.1.5

Updated the version of tauri-plugin-cache from 0.1.4 to 0.1.5 in Cargo.toml, Cargo.lock, README.md, and package.json. This update likely includes improvements or fixes for the plugin.

Update tauri-plugin-cache version in README

Bumped the version of tauri-plugin-cache from 0.1.3 to 0.1.4 in the README example to reflect the latest version.

Remove trailing whitespace in mobile.rs

Cleaned up unnecessary trailing whitespace in the `mobile.rs` file to improve code formatting and maintain consistency.

Update installation instructions in README

Expanded the installation instructions for the Tauri plugin cache, including steps for using `cargo add` and additional package manager commands for `pnpm`, `npm`, and `yarn`.