Transfer code (#1)

* copy project root files

* import previously created code and rename where needed

* fix license and lint

* main is now just a JS wrapper

* minified main.cjs rather than copying to a newly named file

lib/ast.ml

@@ -0,0 +1,14 @@
+module MoveMap = Map.Make (Int)
+
+type tag = { key : string; value : string }
+
+type item =
+  | Move of string
+  | Number of string
+  | Clock of string
+  | Nag of string
+  | Comment of string
+  | Result of string
+  | Variation of item list
+
+type game = { tags : tag list; content : item list; result : string option }