Create README.md

Author: muukii

README.md

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+# IndexedForEach
+
+## Motivation
+The purpose of using IndexedForEach is to read array's element and its index in safe way.  
+As using `.enumerated()` is unsafe way because of the index does not always start from 0.
+
+## Usage
+
+```
+import SwiftUI
+
+struct ContentView: View {
+    let numbers = [1, 2, 3]
+    
+    var body: some View {
+        VStack {
+            IndexedForEach(data: numbers) { index, element in
+                Text("\(index): \(element)")
+            }
+        }
+    }
+}
+```