Add initial README

README.md

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+
+# Comparing `fetch()` implementations
+
+A small project comparing `fetch()` implementations across various platforms
+and packages.
+
+## Platforms
+
+Browser testing is done using [`webdriver`](https://github.com/webdriverio/webdriverio/tree/main/packages/webdriver).
+
+- Chrome
+- Firefox
+- Safari (TODO)
+- Node.js
+  - `node-fetch`
+- Deno (TODO)
+
+
+<!-- vim: set conceallevel=2 et ts=2 sw=2: -->