added readme and screenshots to metals

mods/metals/README.txt

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+Metals: [0.4.x COMPAT] [metals]
+
+Homepage: http://minetest.net/forum/viewtopic.php?id=2526
+License: cc-by-sa for code + textures.
+
+Contributors:
+Jordach
+
+
+Metals:
+This is a mod about metallic structures, pipes, railings and others...if you can name them.
+For now, this will be a simple mod:
+
+All of these crafts can be placed into a furnace for the iron ingots that were used for crafting. (However, corrugated iron wastes one ingot, please be careful.
+License: cc-by-sa for code + textures.
+Other:
+Regards to cactuz_pl, for finding the elusive shapeless craft error.
+Mod Requirements:
+Unified Dyes.
+Crafts:
+Pipe Cover:
+
+Vertical PIpe:
+
+Horizontal Pipe: (Follows player)
+
+Steel Railing:
+
+Corrugated Iron:
+
+"X" Girders:
+
+"X" Warning Girders:
+
+General All Purpose Warning Marker:
+
+Giveme Commands:
+metals:cross_girders
+metals:cross_girders_warning
+metals:warning
+metals:pipe_ud (Vertical Pipe)
+metals:pipe_lr (Horizontal Pipe)
+metals:corregated_iron (Bad spelling)
+metals:pipe_cover
+metals:metal_rails
+metals:half_ingot (One 1/2 of an iron ingot)