Added README

Author: lukaskubanek

README.md

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+# CombineExtensions
+
+A collection of Combine extensions featuring:
+
+- **`CurrentValuePublisher`**
+  - An immutable alternative to `CurrentValueSubject`.
+  - Bridges seamlessly with `CurrentValueSubject` and the `@Published` property wrapper for integration with `ObservableObject`.
+  - Includes custom operator overloads that apply to both current and future values.
+
+- **Operators**
+  - `flatMapLatest`: Transforms elements into publishers, republishing values from the most recent inner publisher while canceling previous ones.
+  - `withPrevious`: Emits tuples of the current and previous elements.