ci: add first draft for SPM

.gitignore

@@ -0,0 +1,6 @@
+# Swift Package Manager
+.netrc
+.swiftpm/configuration/registries.json
+.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
+/Packages
+/.build

Package.swift

@@ -0,0 +1,25 @@
+// swift-tools-version: 5.10
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "AbrevvaSDK",
+    platforms: [
+        .iOS(.v15)
+    ],
+    products: [
+        // Products define the executables and libraries a package produces, making them visible to other packages.
+        .library(
+            name: "AbrevvaSDK",
+            targets: ["AbrevvaSDK"]),
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package, defining a module or a test suite.
+        // Targets can depend on other targets in this package and products from dependencies.
+        .binaryTarget(
+            name: "AbrevvaSDK",
+            path: "AbrevvaSDK.xcframework"
+        )
+    ]
+)