TaboolaSDK SPM support

- introduce support of TaboolaSDK for SPM;
- embed built `*.xcframework` with `Package.swift` file.

Package.swift

@@ -0,0 +1,18 @@
+// swift-tools-version:5.3
+import PackageDescription
+let package = Package(
+    name: "TaboolaSDK",
+    platforms: [
+        .iOS(.v10)
+    ],
+    products: [
+        .library(
+            name: "TaboolaSDK",
+            targets: ["TaboolaSDK"])
+    ],
+    targets: [
+        .binaryTarget(name: "TaboolaSDK",
+                      url: "https://taboola-mobile-sdk.s3.us-west-2.amazonaws.com/ios/spm/3.6.3/TaboolaSDK.xcframework.zip",
+                      checksum: "627f0e75ea83c3ca3c500ddc7af6956d447fad8413609db76a1a44e604f29f9c")
+    ]
+)

README.md

@@ -1 +1,13 @@
-# taboola-spm-ios-sdk
+# taboola-spm-ios-sdk
+
+Swift Package Manager
+
+The Swift Package Manager is a tool for automating the distribution of Swift code and is integrated into the swift compiler.
+
+Once you have your Swift package set up, adding TaboolaSDK as a dependency is as easy as adding it to the dependencies value of your Package.swift.
+
+```
+dependencies: [
+    .package(url: "https://github.com/taboola/taboola-spm-ios-sdk", .upToNextMajor(from: "3.6.3"))
+]
+```