feat: add scratch pad plugin

[hikali123456789]

Summary

Adds a scratch pad plugin for Neovim that provides an interactive floating buffer for quick notes and commands.

Features

• Floating scratch buffer: Opens in a centered floating window
• Configurable position: Supports right, left, top, bottom, or center positioning
• Persistent content: Content persists during the Neovim session
• Easy to use: Simple keymaps (q/Esc to close)
• Commands:
  • :ScratchPad - Open scratch pad
  • :ScratchPadToggle - Toggle scratch pad
  • :ScratchPadClose - Close scratch pad

Usage

-- In your init.lua or plugin config
require("scratch-pad").setup({
  width = 80,
  height = 20,
  position = "right", -- "right", "left", "top", "bottom", "center"
  border = "rounded",
  title = " Scratch Pad ",
})

Screenshots

The scratch pad appears as a floating window with:

• Welcome message with instructions
• Markdown filetype for syntax highlighting
• Persistent content during session
• Easy close with q or <Esc>

Fixes #1