Add PosterLens to Perplexity Cookbook showcase

Author: nickjlamb

docs/showcase/posterlens.mdx

@@ -0,0 +1,40 @@
+---
+title: PosterLens
+description: Turn static scientific posters into interactive research insights
+---
+
+## 🔍 What is PosterLens?
+
+**PosterLens** is a mobile app that transforms static scientific posters into interactive, explorable insights using OCR and AI.
+
+Created for the Perplexity Hackathon 2025, it allows researchers, MSLs, and medical writers to:
+
+- Scan posters using device camera + Apple Vision OCR
+- Ask natural-language questions about the content
+- Find semantically related studies using **Sonar Pro**
+- Auto-generate research questions & future directions
+- Validate citations with PubMed E-utilities
+
+---
+
+## 📸 Screenshots
+
+![PosterLens Screenshot](https://cdn.prod.website-files.com/66d49e8555a289120a81ec3e/68930ad938e072c05d1be0b9_PosterLens.png)
+
+---
+
+## 🔗 Links
+
+- 🧠 GitHub Repo: [PosterLens](https://github.com/nickjlamb/PosterLens)
+- 📲 App Store: [PosterLens on iOS](https://apps.apple.com/us/app/posterlens-research-scanner/id6745453368)
+
+---
+
+## 🧠 How PosterLens Uses Sonar Pro
+
+PosterLens integrates **Sonar Pro** for:
+- Semantic understanding of OCR-extracted poster text
+- Factual Q&A grounded in scientific literature
+- Retrieval of related studies and citation-backed content
+
+Sonar Pro is essential for turning a static scan into a dynamic research experience.