Initial cozybox repo

Import the current cozybox theme into the fresh repository and lighten the default blue accent.

Co-authored-by: Codex <noreply@openai.com>

README.md

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+# cozybox.nvim
+
+Cozybox is a warm, dark Neovim theme with nix-tuned blue and green accents, darker editor surfaces, and syntax overrides baked in.
+
+## Install
+
+```lua
+{ "harivansh-afk/cozybox.nvim", priority = 1000 , config = true, opts = ...}
+```
+
+Neovim `0.8+`.
+
+## Enable
+
+```vim
+set background=dark " or light if you want light mode
+colorscheme cozybox
+```
+
+## Override
+
+```lua
+require("cozybox").setup({
+  transparent_mode = false,
+  palette_overrides = {},
+  overrides = {},
+})
+vim.cmd("colorscheme cozybox")
+```
+
+The theme already defaults to the custom blue/green palette, hard contrast, darker editor surfaces, and syntax highlight tweaks from your nix config.
+See `:h cozybox.nvim` or `lua/cozybox.lua` for the full option surface.