docs(README): add Neovim installation section

[Copilot]

Adds installation instructions for Neovim package managers to make luarrow more discoverable for the Neovim ecosystem.

Changes

• Added "With Neovim" subsection under Installation with setup examples for:
  • lazy.nvim
  • packer.nvim
  • vim-plug
• Included basic usage example for Neovim configs

Example

-- lazy.nvim
{
  "aiya000/luarrow.lua",
  build = "make install-to-local",
}

-- Usage in init.lua
local arrow = require('luarrow').arrow
local fun = require('luarrow').fun

All package managers use the existing make install-to-local build command.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Add a sub section to README.md for installing to Neovim</issue_title>
<issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

Note

Custom agent used: PR Creator Agent
An agent creates PullRequests when assigned to an issue

• Fixes Add a sub section to README.md for installing to Neovim #22

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.