Add README documentation for modules

Modules/BarcodeScanner/README.md

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+#  BarcodeScanner
+
+The barcode scanner presents a video capturing preview and scans the content of it for barcodes.
+
+Example:
+ ```swift
+// Instantiation of the barcode scanner view.
+let barcodeScannerView = BarcodeScannerView.instantiate()
+
+// Configuration of the expected barcode types and the callbacks.
+barcodeScannerView.model = .init(
+    barcodeTypes: [.qr],
+    onScan: { barcodes in
+        print(barcodes)
+    },
+    onError: { error in
+        print(error)
+    }
+)
+
+// Starting the scan process.
+scannerView.startScanning()
+
+// Stopping the scan process.
+scannerView.stopScanning()
+```

Modules/CarouselView/README.md

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+#  CarouselView
+
+The carousel view adds carousel scroll behaviour to an embedded generic `ContentView`.
+
+Example:
+```swift
+// The image urls to be presented as content
+let imageSourceURLs: [URL] = [<#image sources#>]
+
+// Instantiate carousel view with `ImageView` as content views
+let contentView = CarouselView<ImageView>.instantiate()
+
+// Configure the model of the carousel view by mapping the images
+contentView.model = .init(pages: imageSourceURLs.map { .url($0) })
+```

Modules/GridView/README.md

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+#  GridView
+
+The grid view presents a collection of generic `ItemView`s in a grid based layout.
+
+Example:
+
+```swift
+// The image urls to be presented as content
+let imageSourceURLs: [URL] = [<#image sources#>]
+
+// Instantiation with an image view listening to touch events through the action view
+let gridView: GridView<ActionView<ImageView>> = .instantiate()
+
+// Model configuration
+gridView.model = GridViewModel(
+    insets: .zero,
+    spacing: .zero,
+    numberOfColumns: 3,
+    items: imageSourceURLs.map { imageSourceURL in
+        return ActionViewModel(content: .url(imageSourceURL)) { [unowned self] in
+            print("Did tap image view with url: \(imageSourceURL)")
+        }
+    }
+)
+```

Modules/Keychain/README.md

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+#  Keychain
+
+The keychain module provides an easy to use API agnostic to the device keychain and the iOS `Security` framework.
+
+```swift
+struct MyDataRepository {
+    @Secured(key: "<#keychain value identifier#>")
+    var topSecretSecuredValue: Bool
+}
+```

Modules/PageView/README.md

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+#  PageView
+
+The page view adds paged scroll behaviour to an embedded `ContentView`.
+
+Example:
+
+```swift
+// The image urls to be presented as content
+let imageSourceURLs: [URL] = [<#image sources#>]
+
+// Instantiate a page view with image views as content
+let contentView = PageView<ImageView>.instantiate()
+
+// Configure the model
+contentView.model = .init(pages: imageSourceURLs.map { .url($0) })
+```

Modules/UserDefaults/README.md

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+#  UserDefaults
+
+The user defaults module provides a property wrapper to access data in the device user defaults storage.
+
+Example:
+
+```swift
+struct MyDataRepository {
+    @UserDefault(key: "<#value identifier#>", defaultValue: true)
+    var myPersistentProperty: Bool
+}
+```