Add basic ARCHITECTURE.md

Author: waffle-stomper

ARCHITECTURE.md

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+# Ghostwriter.java
+
+This is the first point of contact for Forge.
+It subscribes to Forge's event bus and is responsible for swapping the vanilla book screens for Ghostwriter versions.
+
+# gui > GhostLayer.java
+
+Contains Ghostwriter buttons & methods to supplement the vanilla book interfaces
+
+# gui > screen > GhostWriter*Screen.java
+
+These extend the vanilla book screens, adding a GhostLayer to each