Add Google Financial News Analysis Prompt and tools

[google-labs-jules]

Added Finance/financial_news_prompt.md containing the professional Google Financial News Analysis Prompt.
Added Finance/generate_news_prompt.py to automate the generation of the prompt with custom parameters.
Added Finance/test_generate_news_prompt.py to test the generation script.

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PR created automatically by Jules for task 11926741683664275219 started by @ewdlop

[google-labs-jules]

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