Add docs

TODO.md

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 # v0.1.0 (MVP)
 ## Misc
 - Markers
+- Fix all executable-relative path issues
 
 ## Music Select Screen
 - Options menu

docs/Folder Structure.md

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+# Folder Structure
+This describes how one should lay out files and folders for jujube to properly work with them.
+
+## Overview
+A vanilla install of jujube should look like this :
+
+```
+jujube/
+├─ assets/
+├─ data/
+├─ markers/
+├─ songs/
+└─ jujube
+```
+
+## `assets` folder
+You should not touch this under normal circonstances, it contains things jujube needs to display the fallback theme
+
+## `data` folder
+For now this folder only contains a json representation of the user's preferences
+
+## `markers` folder
+This folder contains your markers, the structure is very simple. Just take a look at what's already there.
+
+## `songs` folder
+At startup, jujube will search for songs recursively from here, this means you *can*, unlike stepmania, have subfolders.
+
+If you don't now how you should arrange you songs, I suggest sticking to the stepmania way :
+
+```
+songs/
+└ pack/
+   └ song/
+     ├ song.memon
+     ├ song.ogg
+     └ song.png
+```