Add README

Author: IanVS

README.md

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+# Mirage-MSW
+
+Experimental [MirageJS](https://miragejs.com/) interceptor using [MSW](https://mswjs.io/).
+
+## Usage
+
+### Installation
+
+Pick one depending on your package manager:
+
+```shell
+npm i --save-dev mirage-msw
+pnpm i --save-dev mirage-msw
+yarn add --dev mirage-msw
+```
+
+If you are not already using MSW or Mirage, you will need to install those as well. Be sure to run [`msw init`](https://mswjs.io/docs/integrations/browser#copy-the-worker-script) as well.
+
+We currently only support MSW v1, though we are exploring v2 support: https://github.com/miragejs/mirage-msw/pull/12
+
+### Configuration
+
+Wherever you are creating your miragejs server, set the interceptor:
+
+```ts
+import MSWInterceptor from 'mirage-msw';
+import { createServer } from 'miragejs';
+
+createServer({
+  interceptor: new MSWInterceptor(),
+  // ... rest of your config
+});
+```
+
+This will cause msw to be used instead of the default interceptor, [pretender](https://github.com/pretenderjs/pretender).
+
+## Caveats
+
+This is very early, experimental software. There are probably a lot of bugs, so if you find one, please report it.
+
+Here are the known issues so far:
+
+- [ ] MSW starts up asynchronously, whereas Mirage up to now has always been completely synchronous. We will probably need to make a breaking change to Mirage to make `createServer` an async function.
+- [ ] Currently no support for FormData requests.
+- [ ] Only works in the browser, same as pretender. But MSW does have an option for node.js, so we may be able to support that in the future.