Initial commit

Half-baked state. Most of the UI is mostly done, but the integration
with Grist (or any other data provider) is still missing.

article_select.gd

@@ -0,0 +1,17 @@
+extends Container
+class_name ArticleSelection
+
+const button_scene = preload("res://article_select_button.tscn")
+
+# Called when the node enters the scene tree for the first time.
+func _ready() -> void:
+	var button
+	var info: ArticleInfo
+	for id in Global.article_infos:
+		button = button_scene.instantiate()
+		button.info = Global.article_infos[id]
+		add_child(button)
+
+# Called every frame. 'delta' is the elapsed time since the previous frame.
+func _process(delta: float) -> void:
+	pass