chore: updated README with key info

Author: snehaljha-sf

README.md

@@ -8,6 +8,8 @@ The Omnistudio Migration Assistant is a command-line interface (CLI) plugin that
 
 - Install Salesforce CLI on your computer. See : [Install Salesforce CLI](https://developer.salesforce.com/docs/atlas.en-us.sfdx_setup.meta/sfdx_setup/sfdx_setup_install_cli.htm).
 
+- To deploy LWC as part of auto-deployment process, environment variable 'OMA_AUTH_KEY' should be set with requested NPM repository access key from Salesforce Customer Support.
+
 ## Install and Run the Omnistudio Migration Assistant
 
 1. Install SF cli using the official documentation located [here](https://developer.salesforce.com/docs/atlas.en-us.sfdx_setup.meta/sfdx_setup/sfdx_setup_install_cli.htm).