Add mod: show_wielded_item

mods/HUD/show_wielded_item/README.md

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+# Show Wielded Item [`show_wielded_item`]
+This Minetest mod displays the name of the wielded item above the hotbar and
+statbars.
+
+This mod is compatible with the HUD Bars [`hudbars`] mod.
+Compability with other HUD-related mods is possible, but not guaranteed.
+
+Version: 1.0.0
+
+## Credits
+Released by Wuzzy.
+The original mod code was taken from the file “`item_names.lua`”
+found in the Unified Inventory mod maintained by VanessaE. This code
+has been later modified.
+Original author: 4aiman
+
+## License
+This mod is licensed under GNU LGPLv2 or later
+(see <https://www.gnu.org/licenses/lgpl-2.1.html>).