docs(provider-transformers): added README.md

Signed-off-by: Neko Ayaka <neko@ayaka.moe>

packages/provider-transformers/README.md

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+# `@proj-airi/provider-transformers`
+
+Experimental provider implementation of [🤗 Transformers.js](https://github.com/huggingface/transformers.js) for [xsai](https://github.com/moeru-ai/xsai).
+
+This enables you possibilities to use any models supported by [🤗 Transformers.js](https://github.com/huggingface/transformers.js) the feel of [xsai](https://github.com/moeru-ai/xsai) just like you are directly request OpenAI API but **pure locally within the browser**.
+
+> This is also possible for runtime with WebGPU or Web Workers support, e.g. Node.js.
+
+> [!WARNING]
+>
+> This haven't been released yet, it is currently only used by [Airi](https://github.com/moeru-ai/airi)'s stage and memory layer, if you found this helpful, join us to discuss on [xsai #41](https://github.com/moeru-ai/xsai/issues/41).
+
+## Example usage
+
+```ts
+// Currently @proj-airi/provider-transformers
+import { createTransformers } from '@xsai-ext/provider-transformers'
+import EmbedWorkerURL from '@xsai-ext/provider-transformers/worker?worker&url'
+import { embed } from '@xsai/embed'
+
+const transformersProvider = createTransformers({ embedWorkerURL: EmbedWorkerURL })
+
+const res = await embed({
+  ...transformersProvider.embed('Xenova/all-MiniLM-L6-v2'),
+  input: 'Hello, world!',
+})
+
+console.log(res.embedding)
+// {
+//   embedding: Array<number>[768],
+// }
+```