Add Stages

Stages.md

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+Stages are the backgrounds of songs. Every week has at least one stage.
+
+# How to make stages
+
+First of all you need a name for the stage. Here i will just use "something"
+
+## Start
+
+Then you need the sprites / images for backgrounds and background characters. Usually they are put into sprites/something folder or images/something folder.
+
+Dont forget that for sprites you need to convert the XML to a JSON file.
+
+## Middle
+
+You place something.json into the stages folder and add this stuff into it. It contains basic variables you will have to change for your stage.
+```
+{
+	"boyfriend": [0, 0],
+	"girlfriend": [0, 0],
+	"opponent": [0, 0],
+
+	"camera_boyfriend": [0, 0],
+	"camera_opponent": [0, 0],
+	"camera_girlfriend": [0, 0],
+}
+
+```
+
+Then, you will have to script your images and sprites into the game yourself. I made a good API for this with image / sprite types so it isn't too hard. You can check some [existing stages](https://git.squog.ru/TaggedEngine/TaggedEngine/src/branch/main/stages/stageErect.lua) and the [type documentation](https://git.squog.ru/TaggedEngine/TaggedEngine/wiki/Types) for help.
+
+Also for more stage script manipulation you need to check the [Scripting Functions](https://git.squog.ru/TaggedEngine/TaggedEngine/wiki/Scripting) page.
+
+### Small example stage script:
+```
+local myTypes = require("modules.types")
+
+local module = {}
+function module.onCreate(song)
+    local back = myTypes.Image("images/stage/stageback.png")
+    back.layer = -10
+    back.position = myTypes.Vector2(-800, 50)
+
+    local front = myTypes.Image("images/stage/stagefront.png")
+    front.layer = -1
+    front.position = myTypes.Vector2(-900, 1000)
+
+    local curtains = myTypes.Image("images/stage/stagecurtains.png")
+    curtains.position = myTypes.Vector2(-1150, 50)
+    curtains.modifier = 1.3
+    curtains.layer = 5
+end
+
+return module
+```