Wrote the basic map specification

Map-File-Format.md

@@ -1,2 +1,54 @@
-TODO: This page is a work in progress, as is the map system of the game.
+The map data is stored in plain text.
+The tiles are zero indexed, with -1 meaning transparent.
+Each layer has it's own tileset.
+
+## Containers
+
+Patch:
+	int xCount, yCount
+	vector<vector<int>> data[xCount][yCount]
+
+Layer:
+	int xCount, yCount
+	vector<vector<Patch>> data[xCount][yCount]
+
+MapUtility:
+	int layerCount
+	list<Layer> data[layerCount]
+	list<Image> tilesets[layerCount]
+
+## File Format
+
+The files are layed out like this:
+
+```
+	[format metadata]
+	[tileset list]
+	[data blob]
+```
+
+The format metadata includes the tile format, the number of tiles in a patch, the number of patches in a layer, and the number of layers and tilesets in the map. It also includes totals, which can be used to verify the formats before loading the data blob.
+The metadata is layed out like this:
+
+```
+tileWidth tileHeight patchXCount patchYCount layerXCount layerYCount layerCount totalXCount totalYCount totalCount;
+```
+
+The tileset list is a list of filenames terminated by semicolons.
+
+The data blob is made up of each tile, layed out from the bottom layer to the top, from the top-left most tile, read X first.
+
+That is to say, in a map with 2 layers, 3 tiles along the X axis and 4 along the y, this is what the data blob would look like:
+
+```
+0 0 0
+0 0 0
+0 0 0
+0 0 0
+
+0 0 0
+0 0 0
+0 0 0
+0 0 0
+```