Issue #18 Add SPM Support

Package.swift

@@ -0,0 +1,29 @@
+// swift-tools-version:5.5
+import PackageDescription
+
+let package = Package(
+    name: "CollectionLayouts",
+    platforms: [
+        .iOS(.v10)
+    ],
+    products: [
+        .library(
+            name: "StoriesLayout",
+            targets: ["StoriesLayout"]
+        ),
+        .library(
+            name: "SafariLayout",
+            targets: ["SafariLayout"]
+        )
+    ],
+    targets: [
+        .target(
+            name: "StoriesLayout",
+            path: "StoriesLayout/Classes"
+        ),
+        .target(
+            name: "SafariLayout",
+            path: "SafariLayout/Classes"
+        )
+    ]
+)

README.md

@@ -28,10 +28,24 @@ This is a UICollectionViewLayout that reproduce the Instagram Stories experience
 just use StoriesCollectionViewLayout in your UICollectionView and subclass your cells from StoriesCollectionViewCell!
 
 ### Installation
-* Via cocoapods:  
+
+**via Cocoapods:**
+
 ```ruby 
 pod 'StoriesLayout' 
 ```
 
+**via Swift Package Manager:**
+
+Add the package in Xcode: **File > Add Packages…** and use:
+
+```
+https://github.com/Oni-zerone/CollectionLayouts
+```
+
+Then import one of:
+- `StoriesLayout`
+- `SafariLayout`
+
 ### Usage
 You can find more info about usage in the [wiki](https://github.com/Oni-zerone/CollectionLayouts/wiki/StoriesLayout)