Add README file

Signed-off-by: Chloe <pinkcloudvnn@gmail.com>

packages/opencommerce/README.md

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+## Open Commerce Provider
+
+**Preview:** https://commerce-pinkcloudvnn.vercel.app/
+
+We are using this admin interface for demo: https://admin.open-commerce.io/
+Storefront API URL: https://api.open-commerce.io/graphql
+
+## Available Features
+
+- Cart
+- Search
+- Custom Checkout
+
+## Steps to get started:
+
+1. Duplicate `site/.env.template` and rename it to `site/.env.local`
+2. Setup env variables related to open commerce provider, something looks like this:
+
+```
+COMMERCE_PROVIDER=@vercel/commerce-opencommerce
+OPENCOMMERCE_STOREFRONT_API_URL=https://api.open-commerce.io
+OPENCOMMERCE_PRIMARY_SHOP_ID=xxxxxxxxxxxxxxxxxxxxxxxxxxxx
+OPENCOMMERCE_IMAGE_DOMAIN=api.open-commerce.io
+OPENCOMMERCE_STRIPE_API_KEY=
+```
+
+3. Run `yarn` and `yarn dev` in the root folder
+
+### Troubleshoot
+
+https://github.com/reactioncommerce/commerce#troubleshoot
+
+For more information about the repository, check out the README file here: https://github.com/reactioncommerce/commerce