chore: update readme instructions for including Momento in Package.sw…

…ift file (#97)

* chore: update readme instructions for including Momento in Package.swift file

* use swift tools version 5.7

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version: 5.4
+// swift-tools-version: 5.7
 // The swift-tools-version declares the minimum version of Swift required to build this package.
 
 import PackageDescription

README.md

@@ -17,18 +17,38 @@ To get started with Momento you will need a Momento API key. You can get one fro
 
 ## Packages
 
-The Momento Swift SDK is available here on github: [momentohq/client-sdk-swift](https://github.com/momentohq/client-sdk-swift). Add the following to the `dependencies` section of your `Package.swift` file to include the SDK in your project:
-
-```bash
-.package(url: "https://github.com/momentohq/client-sdk-swift", exact: "0.2.1")
-```
-
-Your target dependencies will refer to the Momento SDK like so:
-
-```bash
-dependencies: [
-    .product(name: "momento", package: "client-sdk-swift"),
-],
+The Momento Swift SDK is available here on github: [momentohq/client-sdk-swift](https://github.com/momentohq/client-sdk-swift). 
+
+Edit your `Package.swift` file to include the SDK in your project:
+
+```swift
+// swift-tools-version: 5.7
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "momento-example",
+    platforms: [.macOS(.v10_15), .iOS(.v13)],
+    products: [
+        .executable(
+            name: "momento-example",
+            targets: ["momento-example"]
+        ),
+    ],
+    dependencies: [
+        .package(url: "https://github.com/momentohq/client-sdk-swift", exact: "0.3.1")
+    ],
+    targets: [
+        .executableTarget(
+            name: "momento-example",
+            dependencies: [
+                .product(name: "Momento", package: "client-sdk-swift"),
+            ],
+            path: "Sources"
+        ),
+    ]
+)
 ```
 
 ## Usage