Lab document for Contos Air template

[akshay-online]

This pull request includes a comprehensive update to the labs/vstsextend/nodejs/readme.md file, adding detailed instructions on deploying a Node.js application to Azure using Azure DevOps. The most important changes include the addition of a new overview section, step-by-step exercises for creating an ARM service connection, and configuring the Azure DevOps pipeline.

Documentation Enhancements:

• Overview Section: Added a new overview section explaining the purpose and content of the lab, including a brief introduction to Node.js and what will be covered in the lab. (labs/vstsextend/nodejs/readme.md)
• Exercise 1: Creating ARM Service Connection: Added detailed steps for creating a service connection to Azure Resource Manager, including screenshots and explanations for each step. (labs/vstsextend/nodejs/readme.md)
• Exercise 2: Configuring the Azure DevOps Pipeline: Added instructions for editing and validating the Azure DevOps pipeline, including steps to update the service connection details and commit changes to the master branch. (labs/vstsextend/nodejs/readme.md)

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