📝 Add README.md

Author: momocow

README.md

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+# Cloudflare Worker LeetCode Progress
+
+> Generate LeetCode progress as a SVG deployed on Cloudflare Workers.
+
+## Usage
+
+```js
+
+const createHandler = require('@momocow/cloudflare-worker-leetcode-progress').default
+const handleRequest = createHandler({ /* options */ });
+
+addEventListener('fetch', (event) => {
+  event.respondWith(handleRequest(event) ?? new Response('', { status: 405 }));
+});
+```
+
+> Remember to configure your `wrangler.toml` to build with webpack.
+>
+> ```toml
+> type = "webpack"
+> ```