[Program]: Add "European Summer of Code" to Programs Section

[ShreshthaAggarwal27]

Program Name

European Summer of Code (ESoC)

Official Website

https://www.esoc.dev/

Program Dates

2026 projects are released in two batches: February 18, 2026 and March 19, 2026

Eligibility Criteria

No response

Why should this be added?

• Expands program coverage beyond Google Summer of Code
• Provides European-focused open-source opportunity
• Encourages geographical diversity
• Aligns with OpenSource Compass mission of structured guidance
• Helps users discover lesser-known but valuable programs
• Improves completeness of the Programs section

[github-actions]

Thanks @ShreshthaAggarwal27! 👋
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