Update README.md

Author: mackoj

README.md

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 # swift-snapshot-testing-plugin-webp
+
+This repo is an experimental use of this branch([mackoj:feat/imageSerializer](https://github.com/mackoj/swift-snapshot-testing/tree/feat/imageSerializer)) that contains a PluginAPI for `swift-snapshot-testing`.
+
+The goal of this is to show how easy it is to build a plugin.
+
+## Usage
+
+- Add this project to dependencies inside your `Package.swift`  -> `.package(url: "https://github.com/mackoj/swift-snapshot-testing-plugin-webp.git", revision: "0.0.1"),`.
+- Then add this to your test target `.product(name: "WEBPImageSerializer", package: "swift-snapshot-testing-plugin-webp"),`.
+- Then add this to the top of your test file `import WEBPImageSerializer` and in the `setUp()` add this `SnapshotTesting.imageFormat = WEBPImageSerializer.imageFormat`.
+
+## TODO
+
+- [ ] use [libjxl](https://github.com/libjxl/libjxl) instead of [JXLCoder]([url](https://github.com/awxkee/jxl-coder-swift.git)).
+- [ ] make the API ready for Swift 6 and async/throwing functions
+- [ ] create a tests suite
+- [ ] add documentations
+- [ ] add tutorials