Update README with image and project details

Added an image and enhanced the project description.

Author: ComputelessComputer

README.md

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 # Philo
 
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 A daily journaling app that builds things for you.
 
 Write your notes in a timeline, manage tasks that carry forward automatically, and hit **⌘↵** to generate custom mini-apps — a calorie tracker, a world clock, a habit chart — embedded right inside your journal.