Change name and new license disclaimer.

Changed name from "NOTICE" to "COPYING" to fit GNU conventions. https://www.gnu.org/licenses/
Updated to GNU license boilerplate.

Signed-off-by: Ryan <[email protected]>

Author: ryanlua

src/SignsInternal/COPYING.server.lua

@@ -0,0 +1,10 @@
+--[[
+A Roblox Studio Plugin which creates a customizable TextLabel parented to a Part.
+Copyright (C) 2023 The Winners Games
+
+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/>.
+--]]