Add README

Author: exanubes

README.md

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+# Bitwise
+
+A hands-on learning tool for understanding bitwise operations. Every operation — including binary ↔ decimal conversion — is implemented manually without abstractions to see exactly how the math works under the hood.
+
+## Operations Covered
+
+- **AND** — bits set in both operands
+- **OR** — bits set in either operand
+- **XOR** — bits set in one operand but not both
+- **LSHIFT** — shift bits left (multiply by powers of 2)
+- **RSHIFT** — shift bits right (divide by powers of 2)
+
+## Features
+
+- Chainable operations in the UI — build multi-step expressions interactively, e.g., how the snowflake id is generated
+- BigInt support for large numbers
+- Binary and decimal display side-by-side
+- Dark/light theme toggle
+
+## Quick Start
+
+```bash
+pnpm install
+pnpm dev
+```