docs: Add lazy.nvim installation instructions

[zeroicey]

Hi! Thanks for creating this awesome plugin.

I noticed the README currently only includes installation instructions for packer. Since many users have migrated to lazy.nvim, I've added a configuration example to help new users get started easily.

Changes included:

• Added a Lazy.nvim installation snippet.
• Used the keys table for lazy-loading, so the plugin only loads when the specific keymaps are pressed (improving startup time).
• Used the opts = {} shorthand which automatically calls .setup(), keeping the config clean.
• Kept the default keymaps consistent with the existing Packer example (K, J, etc.).

Hope this helps!

[ghillb]

thanks!