chore: add GPLv3 (or later) licensing to repository

NOTE: lua/lazyload.lua is an MIT licensed file borrowed from another
user's repository. The license header in that file reflects this.

lua/keymaps.lua

@@ -4,6 +4,21 @@
   └────────────────────────────────────────────────────────────────┘
 --]]
 
+-- Copyright (C) 2026 rootiest
+--
+-- This program is free software: you can redistribute it and/or modify
+-- it under the terms of the GNU General Public License as published by
+-- the Free Software Foundation, either version 3 of the License, or
+-- (at your option) any later version.
+--
+-- This program is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+-- GNU General Public License for more details.
+--
+-- You should have received a copy of the GNU General Public License
+-- along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
 -- System Clipboard Integration
 -- This makes 'y' and 'p' (and all other yank/paste operations) 
 -- use the system clipboard by default.

lua/lazyload.lua

@@ -1,3 +1,13 @@
+--[[
+  ┌────────────────────────────────────────────────────────────────┐
+  │                            Lazyload                            │
+  └────────────────────────────────────────────────────────────────┘
+--]]
+
+-- Original work Copyright (c) 2021 Fredrik Averpil
+-- This file is licensed under the MIT License.
+-- See: https://github.com/fredrikaverpil/dotfiles/blob/main/LICENSE
+
 -- Lazyload queues for phased plugin loading.
 --
 -- on_vim_enter(fn):                    async fire-and-forget via vim.schedule() (default)

lua/options.lua

@@ -4,6 +4,21 @@
   └────────────────────────────────────────────────────────────────┘
 --]]
 
+-- Copyright (C) 2026 rootiest
+--
+-- This program is free software: you can redistribute it and/or modify
+-- it under the terms of the GNU General Public License as published by
+-- the Free Software Foundation, either version 3 of the License, or
+-- (at your option) any later version.
+--
+-- This program is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+-- GNU General Public License for more details.
+--
+-- You should have received a copy of the GNU General Public License
+-- along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
 -- Autowrite/Autosave
 -- This ensures changes are saved on every buffer change or when leaving insert mode.
 vim.api.nvim_create_autocmd({ "InsertLeave", "TextChanged" }, {

lua/plugins.lua

@@ -4,6 +4,21 @@
   └────────────────────────────────────────────────────────────────┘
 --]]
 
+-- Copyright (C) 2026 rootiest
+--
+-- This program is free software: you can redistribute it and/or modify
+-- it under the terms of the GNU General Public License as published by
+-- the Free Software Foundation, either version 3 of the License, or
+-- (at your option) any later version.
+--
+-- This program is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+-- GNU General Public License for more details.
+--
+-- You should have received a copy of the GNU General Public License
+-- along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
 -- Catppuccin.nvim
 -- Eagerly load the colorscheme plugin.
 vim.pack.add({ { src = "https://github.com/catppuccin/nvim", name = "catppuccin" } })