Missing command to create Python virtual environment on Windows OS

[Menghua1]

Description:
On Windows, running the command source .venv/bin/activate fails with the following error:

Repro Steps:

1. Run git clone https://github.com/neondatabase-labs/rag-neon-postgres-openai-azure-python.
2. Run cd rag-neon-postgres-openai-azure-python.
3. Run python3 -m venv .venv.
4. Run source .venv/bin/activate.

Environment:

• Azd version: azd version 1.14.0 (commit c928795c47f27d1e997c217147dc649054ac05c8)
• OS: Windows

Expected behavior:
Successfully activated the python virtual environment on Windows OS.

Suggestion:
Add the command .\.venv\Scripts\activate for Windows environment in Readme.md.

@Boburmirzo and @hemarina for notification.

[Boburmirzo]

@Menghua1 Thanks for the suggestion! I added the commnd it for Windows as well.

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