Add README

Updated README.md to include project details and painting instructions.

Author: Pranav-MSK

README.md

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+# 🌍 The Global Rorschach Canvas
+
+A slow-motion collaborative art experiment.
+
+## 🎨 How to Paint
+
+1. Click “Issues”
+2. Create a new Issue
+3. Use this format:
+
+Paint [A5] #FF5733
+
+That’s it.
+
+You may paint once every 24 hours.
+
+Tiles lock for 1 hour after being painted.
+
+---
+
+## 🖼 Live Canvas
+
+![Canvas](map.svg?ts=0)
+
+---
+
+## 📜 Rules
+
+- Format must be: `Paint [Coordinate] #HEXCODE`
+- Coordinates range from A1 to P16
+- One paint per user every 24h
+- Tile locks for 1 hour after painting
+- Invalid format → issue labeled `Invalid`
+- History is permanently logged
+
+---
+
+## 🔥 Most Contested Pixel
+Coming soon...
+
+---
+
+## 🏆 Top Painters
+Coming soon...