Clean up repository structure and release docs

sources/core/AnnotationHitTesting.swift

@@ -0,0 +1,46 @@
+import Foundation
+import PDFKit
+
+public enum AnnotationHitTesting {
+    public static func containsTextMarkupPoint(
+        _ point: CGPoint,
+        in annotation: PDFAnnotation,
+        tolerance: CGFloat = 3
+    ) -> Bool {
+        guard AnnotationKeys.annotation(annotation, hasSubtype: .highlight)
+                || AnnotationKeys.annotation(annotation, hasSubtype: .underline)
+        else {
+            return annotation.bounds.insetBy(dx: -tolerance, dy: -tolerance).contains(point)
+        }
+
+        let quadPoints = annotation.quadrilateralPoints ?? []
+        guard !quadPoints.isEmpty else {
+            return annotation.bounds.insetBy(dx: -tolerance, dy: -tolerance).contains(point)
+        }
+
+        var index = 0
+        while index + 3 < quadPoints.count {
+            let points = quadPoints[index..<(index + 4)].map { value in
+                let relativePoint = value.pointValue
+                return CGPoint(
+                    x: annotation.bounds.minX + relativePoint.x,
+                    y: annotation.bounds.minY + relativePoint.y
+                )
+            }
+            if boundingRect(for: points).insetBy(dx: -tolerance, dy: -tolerance).contains(point) {
+                return true
+            }
+            index += 4
+        }
+
+        return false
+    }
+
+    private static func boundingRect(for points: [CGPoint]) -> CGRect {
+        guard let first = points.first else { return .null }
+
+        return points.dropFirst().reduce(CGRect(origin: first, size: .zero)) { rect, point in
+            rect.union(CGRect(origin: point, size: .zero))
+        }
+    }
+}