Add a on_joinplayer handler

ROADMAP

@@ -226,7 +226,7 @@ It's really fast. May be used on a website, to show the actual map.
 - see https://github.com/chipgw/minetest-mumble-wrapper
 *** v0.0.2
 **** [feature_showLevel] Our own mod
-     CLOCK: [2018-12-30 dim. 18:06]
+     CLOCK: [2018-12-30 dim. 18:06]--[2018-12-30 dim. 18:40] =>  0:34
      *xpro doesn't show total level ? Maybe write a show_level mod ?*
 - [X] First create our own mod/nint.lua with depends description etc...
 - [ ] Must get xpro mod and register two handler

mods/show_level/init.lua

@@ -1,6 +1,26 @@
 -- Permanently shows the player's level
 
 
+
+local update_level = function(playername)
+   minetest.log("error", "[show_level] Updating level for "..playenername)
+   local player = minetest.get_player_by_name(playername)
+   player:hud_add({
+	 hud_elem_type = "text",
+	 scale = {x=100,y=100},
+	 text = "1",
+	 number =  0x00FF00, -- full green
+	 alignment = {x=0,y=1},
+	 offset = {x=0, y=-32},
+   })
+end
+
+-- Showing level when a player join
+minetest.register_on_joinplayer(function(player)
+      local name = player:get_player_name()
+      update_level(name)
+end)
+
 xpro.register_on_add_xp(function(name, xp_added, lvl_changed)
       minetest.log("error", "[show_level] Updating level")