Add new FODMAP resources (podcast and research)

[arran4]

Added a new "Podcasts" section to README.md and index.md with a link to the "Low FODMAP Diet and IBS Podcast". Added two recent (2026) research papers to research.md.

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PR created automatically by Jules for task 8886575827753811299 started by @arran4

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[gemini-code-assist]

Code Review

This pull request adds a new "Podcasts" section to both README.md and index.md featuring the "Low FODMAP Diet and IBS Podcast". Additionally, it introduces a "2026" research section in research.md with two new studies. The reviewer suggested removing trailing periods from the newly added research paper titles in research.md to maintain formatting consistency.