Update readme files, add level editor tutotiral

LEVEL_EDITOR.md

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+# How to use the Level Editor
+The game has a VERY crude level editor which isn't really user-friendly
+right now. It works with Minetest chat commands (refer to Minetest help to
+learn how they work). Remember you can use "`/help <command>`" for a
+syntax reference of a command.
+
+To start, first enter the "`/editor`" command in chat,
+then choose a size with "`/editor_size`".
+There is no Creative Mode inventory, so you have to give yourself the
+blocks with "`/giveme`" or by using a mod.
+The Ultra Pickaxe removes blocks.
+When you're happy with the level, use "`/editor_save`". The level
+will be saved in your world directory (so be careful to not delete
+your world!).
+
+To work properly, a level needs to:
+* To be solvable (duh!)
+* At least one treasure chest (locked or unlocked)
+* Exactly ONE teleporter in "off" state (`lzr_teleporter:teleporter_off`)
+  (The player starts here, it also acts as a simple game menu when punched)
+
+Do not mind the wooden boundary of the level, this is a dummy that will
+be replaced with the material specified in the level list, it is NOT
+part of the level file. Instead, the level border nodes are specified in the
+level list (see below).
+
+To test a custom level, use "`editor_load`" and then "`editor exit`".
+Note this is still quite buggy. The game doesn't really support playing
+custom levels well, sorry. :(
+
+## Adding the level to the game
+If you think you made a nice level, send it to Wuzzy per e-mail at
+Wuzzy@disroot.org. This game desperately needs more levels, so submissions
+are appreciated. :D
+
+If you don't want to wait for Wuzzy and add the level manually on your own 
+computer, so that it appears in your level list, you must copy the level
+`.mts` file to `mods/lzr_levels/schematics`,
+give it a proper file name and then add a line to
+`mods/lzr_levels/data/level_data.csv`.
+
+A line follows this format:
+
+    <file name>,<level name>,<border list>,<ambience>
+
+where:
+
+* `<file name>`: File name of the level `.mts` file
+* `<level name>`: Name of the level as shown to the player, in English
+* `<border list>`: List of border blocks, see below
+* `<ambience>`: Ambient sounds. Either `ocean`, `temple` or `none`.
+
+Border list is a list of nodes used for the level border.
+It contains 1-4 node names, separated by `|`. The border nodes are, in this order:
+
+* Wall|Window|Floor|Ceiling
+
+Wall is mandatory, the rest is optional. If window, floor or ceiling are missing,
+they will the same as wall.

README.md

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 # Lazarr!
 A laser puzzle game by Wuzzy.
 
-Send lasers to the detector to get to the next level. There are 10 levels.
-You have mirrors and other things to redirect the lasers.
+You're a pirate in the search of treasure. Find all shiny gold blocks
+in treasure chests to advance to the next level.
+To break the lock, you must first solve a laser puzzle by sending lasers
+to all detectors. Mirrors and other things will help you.
 
 Originally, this game was hastily made for the Minetest Game Jam 2021 in the
 final day of the competition.
-The game has seen improvement since then.
+The game has seen a few improvements since then.
 
+There aren't a lot of levels, and those aren't really great
+(I'm lacking good level ideas), but maybe in a later version
+there will be more and better levels.
+
+## How to play
+You need Minetest version 5.5.0 (or later) to play this.
+
+Refer to Minetest documentation to learn how to install a game in Minetest.
+
+Once installed, create a world and start. The world contains your game's
+progress. You start in the captain's room with a book, use the book
+and select a level. Completed levels are in green.
+
+## Level Editor
+Lazarr! contains a very crude level editor. It's not great but better than nothing.
+
+See `LEVEL_EDITOR.md` to read how it works.
+
+## Credits/License
 See CREDITS.md for credits and license.