chore: add README.md

README.md

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+# FastStore Plugin PoC
+
+## How to
+
+First of all you'll need to clone this repo and build it using `yarn build`.
+
+Next you'll have to clone the [FastStore repo](https://github.com/vtex/faststore) at the `poc/plugins` branch.
+
+Run `yarn install` on the monorepo root and cd into `packages/cli`. In the `packages/cli`, run `yarn build` and `yarn link`.
+
+For the next step, clone the [starter](https://github.com/vtex-sites/starter) and switch to the same `poc/plugins`.
+
+Change the path of the `@faststore/plugin-test` on the store's package.json to where you cloned this repo, run `yarn install`, then run `yarn link @faststore/cli`.
+
+Finally run `yarn dev` on the store's directory and you should see the plugin page on http://localhost:3000/my-account.
+
+If you make any changes to either faststore/cli or the plugin you'll have to rebuild them via `yarn build`.