Move compound-ios package into the project.

compound-ios/Sources/Compound/BaseStyles/CompoundTextFieldStyles.swift

@@ -0,0 +1,16 @@
+//
+// Copyright 2022-2024 New Vector Ltd.
+//
+// SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+// Please see LICENSE files in the repository root for full details.
+//
+
+import SwiftUI
+
+public extension Text {
+    /// Styles a text with the Compound design tokens to be displayed as a text field placeholder.
+    func compoundTextFieldPlaceholder() -> Text {
+        font(.compound.bodyLG)
+            .foregroundColor(.compound.textSecondary)
+    }
+}