Update readme

Author: florianpircher

README.md

@@ -1,3 +1,31 @@
-# ByteSymbols
+# Swift Byte Symbols
 
 A simple Swift package that exposes an `ASCII` namespace with named constants for the 128 ASCII code points.
+
+## Using Swift Byte Symbols in your project
+
+Add `swift-byte-symbols` as a dependency to your package:
+
+```swift
+let package = Package(
+    // ...
+    dependencies: [
+        .package(url: "https://github.com/Formkunft/swift-byte-symbols", .upToNextMajor(from: "2.0.0")),
+    ],
+    targets: [
+        .target(
+            // ...
+            dependencies: [
+                .product(name: "ByteSymbols", package: "swift-byte-symbols"),
+            ]),
+    ]
+)
+```
+
+Then, import `ByteSymbols` in your code:
+
+```swift
+import ByteSymbols
+
+// ...
+```