docs: add readme.

README.md

@@ -1,2 +1,60 @@
-# astro-uploader
+# Astro Uploader
+
 A uploader for uploading the Astro generated files through the S3 API.
+
+## Installation
+
+```bash
+# Use npm
+npm install -D astro-uploader
+
+# Use pnpm
+pnpm add -D astro-uploader
+
+# Use yarn
+yarn add -D astro-uploader
+```
+
+```ts
+// astro.config.ts
+import { defineConfig } from 'astro/config'
+import { uploader, type Options } from 'astro-uploader'
+
+export default defineConfig({
+  integrations: [
+    uploader({
+      paths: ['images', 'og', 'cats'],
+      endpoint: process.env.S3_ENDPOINT,
+      bucket: process.env.S3_BUCKET as string,
+      accessKey: process.env.S3_ACCESS_KEY as string,
+      secretAccessKey: process.env.S3_SECRET_ACCESS_KEY as string,
+    }),
+  ],
+})
+```
+
+## Options
+
+```ts
+type Options = {
+  // The directories that you want to upload to S3.
+  paths: string[];
+  // Whether to keep the original files after uploading.
+  keep?: boolean;
+  // Whether to override the existing files on S3.
+  // It will be override only when the content-length don't match the file size by default.
+  override?: boolean;
+  // The S3 region, set it if you use AWS S3 service.
+  region?: string;
+  // The endpoint, set it if you use 3rd-party S3 service.
+  endpoint?: string;
+  // The name of the bucket.
+  bucket: string;
+  // The root directory you want to upload files.
+  root?: string;
+  // The access key id.
+  accessKey: string;
+  // The secret access key.
+  secretAccessKey: string;
+};
+```