Update README.md

Author: Ian-Montgomery-Klaviyo

README.md

@@ -47,8 +47,9 @@ This SDK is organized into the following resources:
 
 You can install this library using `npm`.
 
-`npm install [email protected]`
-
+```bash
+npm install [email protected]
+```
 
 ## source code
 
@@ -72,6 +73,16 @@ If you want to test out the repo but don't have a consuming app, you can run our
 ```
 npm run sample --pk=<YOUR PRIVATE KEY HERE>
 ```
+## OAuth Beta
+
+To read about our OAuth beta for users who want to write multi-user integrations, check out this [help center article](https://help.klaviyo.com/hc/en-us/articles/18819413031067#h_01HACEKGF33GHFEH733YK2JKTT)
+
+If you already are in the OAuth beta, read the documentation in the [`oauth-beta` branch](https://github.com/klaviyo/klaviyo-api-node/tree/oauth-beta) in this repo or check out the [example application](https://github.com/klaviyo-labs/node-integration-example).
+
+Install the beta package with the following command:
+```bash
+npm i klaviyo-api@beta
+```
 
 # Usage Example
 
@@ -1919,4 +1930,4 @@ The parameters follow the same naming conventions as the resource groups and ope
 We stick to the following convention for parameters/arguments
 
 2. All query and path params that are tagged as `required` in the docs are passed as positional args.
-3. There is no need to pass in your private `apiKey` for any operations, as it is defined upon api instantiation; public key is still required where its used.
+3. There is no need to pass in your private `apiKey` for any operations, as it is defined upon api instantiation; public key is still required where its used.