add contrib directory to make xcframework job work

Signed-off-by: Lukas Pukenis <[email protected]>

contrib/darwin/module.modulemap

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+module libdropFFI {
+  umbrella "."
+  export *
+}
+

contrib/swift_package/Package.swift

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+// swift-tools-version: 5.9
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "LibdropSwift",
+    platforms: [
+        .iOS(.v13),
+        .macOS(.v10_15),
+        .tvOS(.v17)
+    ],
+    products: [
+        .library(
+            name: "LibdropSwift",
+            targets: ["LibdropSwift", "libdropFFI"]),
+    ],
+    targets: [
+        .target(
+            name: "LibdropSwift",
+            dependencies: [
+                "libdropFFI"
+            ],
+            path: "Sources",
+            linkerSettings: [.linkedFramework("CoreServices")]
+            ),
+        .binaryTarget(
+            name: "libdropFFI",
+            url: "$XCFRAMEWORK_URL",
+            checksum: "$XCFRAMEWORK_CHECKSUM"
+        )
+    ]
+)

contrib/swift_package/Sources/LibdropSwift.swift

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+@_exported import libdropFFI