feat: added lua-fenster (#53)

types/fenster/fenster.d.tl

@@ -0,0 +1,56 @@
+--[[
+
+Type definitions for lua-fenster
+https://github.com/jonasgeiler/lua-fenster
+https://luarocks.org/modules/jonasgeiler/fenster
+
+--]]
+
+local record fenster
+
+	record Window
+		userdata
+
+		close: function(self: Window)
+		loop: function(self: Window): boolean
+		set: function(self: Window, x: integer, y: integer, color: integer)
+		get: function(self: Window, x: integer, y: integer): integer
+		clear: function(self: Window, color: integer)
+
+		metamethod __index: function(self: Window, key: string): any
+		metamethod __gc: function(self: Window)
+		metamethod __close: function(self: Window)
+		metamethod __tostring: function(self: Window): string
+
+		-- properties using __index
+		keys: {boolean}
+		delta: number
+		mousex: integer
+		mousey: integer
+		mousedown: boolean
+		modcontrol: boolean
+		modshift: boolean
+		modalt: boolean
+		modgui: boolean
+		width: integer
+		height: integer
+		title: string
+		scale: integer
+		targetfps: number
+	end
+
+	open: function(width: integer, height: integer, title: string, scale: integer, targetfps: number): Window
+	sleep: function(milliseconds: integer)
+	time: function(): integer
+	rgb: function(redorcolor: integer, green: integer, blue: integer): integer, integer, integer
+
+	-- methods used as functions
+	close: function(window: Window)
+	loop: function(window: Window): boolean
+	set: function(window: Window, x: integer, y: integer, color: integer)
+	get: function(window: Window, x: integer, y: integer): integer
+	clear: function(window: Window, color: integer)
+
+end
+
+return fenster