Add a minetest.conf.example with all available settings

minetest.conf.example

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+# This file contains settings of minetest_game that can be changed in your 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
+# Do not lose your inventory in the case of death.
+#disable_bones = false
+
+# Whether fire should be disabled (all fire nodes will instantly disappear)
+#disable_fire = false