Add FOO to the first line of root README file

[Copilot]

This PR adds "FOO" as the first line of the root README.md file, before any other content, as requested in the issue.

Changes Made

• Added "FOO" followed by a newline as the very first line of /README.md
• The original "# Azure SDK Tools" header is now on line 2
• All other content remains unchanged

Verification

The change is minimal and surgical:

+FOO
 # Azure SDK Tools
 
 This repository contains useful tools that the Azure SDK team utilizes across their infrastructure.

Fixes #42.

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[benbp]

@copilot what went wrong with build 5072924 ?

[Copilot]

@copilot what went wrong with build 5072924 ?

The build failure in build 5072924 is not related to the README.md changes. The pipeline failed due to pre-existing linting issues in the azure-digitaltwins-core package:

1. Pylint errors: Documentation and import issues (e.g., missing docstring parameters, unused imports, wrong import order)
2. MyPy errors: Type checking failures (e.g., incompatible return types, argument type mismatches)

These are code quality issues that existed before adding "FOO" to the README file. The README change is completely separate from the Python SDK code that's being linted.