movement and stuff, more data

ReadMe.md

@@ -8,10 +8,11 @@ Each node is an `x`, `y`, and `z` position. The optional 4th item is `true` to
 display the node's name, a string to display *that* as the node name, or `false`
 to completely hide a node. `edges` is an array of arrays of two names of nodes.
 An optional 3rd item can be set to `false` to hide an edge, or a string for a
-custom label.
+custom label. `edges` can be nonexistent.
 
-- TODO: Make drag and drop loading of a JSON file possible. :D
-- TODO: Make it not error with no map file.
+WASD panning and -/+ to zoom.
+
+You can drag and drop a JSON file to load it.
 
 ## Example JSON