Add a minetest.conf.example with all available settings

minetest.conf.example

+# This file contains settings of minetest_game that can be changed in
+# minetest.conf
+#
+# By default, all the settings are commented and not functional.
+# Uncomment settings by removing the preceding #.
+
+# Whether creative mode (fast digging of all blocks, unlimited resources) should be enabled
+#creative_mode = false
+
+# The time in seconds after which the bones of a dead player can be looted by everyone
+# 0 to disable
+#share_bones_time = 1200
+
+# Whether fire should be disabled (all fire nodes will instantly disappear)
+#disable_fire = false
+
+# Whether steel tools, torches and cobblestone should be given to new players
+#give_initial_stuff = false
+
+# Whether the TNT mod should be enabled
+#enable_tnt = <true in singleplayer, false in multiplayer>
+
+# The radius of a TNT explosion
+#tnt_radius = 3