Rename 'killme' mod to 'game_commands', add README and license files

mods/game_commands/README.txt

+Minetest Game mod: game_commands
+================================
+See license.txt for license information.
+
+Authors of source code
+----------------------
+rubenwardy (MIT)

mods/killme/init.lua → mods/game_commands/init.lua

@@ -13,7 +13,8 @@ minetest.register_chatcommand("killme", {
 					end
 				end
 
-				-- There doesn't seem to be a way to get a default spawn pos from the lua API
+				-- There doesn't seem to be a way to get a default spawn pos
+				-- from the lua API
 				return false, "No static_spawnpoint defined"
 			end
 		else

mods/game_commands/license.txt

+License of source code
+----------------------
+
+The MIT License (MIT)
+Copyright (C) 2017-2018 rubenwardy <rubenwardy@gmail.com>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this
+software and associated documentation files (the "Software"), to deal in the Software
+without restriction, including without limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of the Software, and to permit
+persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or
+substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
+FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
+
+For more details:
+https://opensource.org/licenses/MIT