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.

data_resources/article_info.gd

@@ -0,0 +1,13 @@
+extends Resource
+class_name ArticleInfo
+
+var id: String
+var text: String
+var icon: Texture
+var price_cents_per_gram: float
+
+func _init(p_id: String, p_text: String, p_icon: Texture, p_price_cents_per_gram: float) -> void:
+	id = p_id
+	text = p_text
+	icon = p_icon
+	price_cents_per_gram = p_price_cents_per_gram