Add screenshot folder structure for TallyFlow Capture and Core

TallyFlow/Marketing/Assets/Screenshots/README.md

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+# TallyFlow Screenshots
+
+This folder is for organizing app and web screenshots used for the TallyFlow website and marketing materials.
+
+## Recommended Structure
+
+- **TallyFlow Capture/**
+  - `iOS/` – iPhone / iPad screenshots
+  - `Android/` – Android phone / tablet screenshots
+  - `Web/` – Web app / dashboard screenshots
+
+- **TallyFlow Core/**
+  - Web dashboard and admin screenshots
+
+## Guidelines
+
+- Use descriptive filenames (e.g., `capture-android-job-detail.png`, `capture-ios-freight-claim.png`)
+- Keep original high-resolution versions here
+- Optimize/compress copies as needed for the website
+- Note the device and version when possible
+
+*Created: June 25, 2026*