docs: add Games built with qcge section (Quantum Breakout + QuantaVania)

Author: ashmitjsg

readme.md

@@ -20,6 +20,18 @@ The features I have included are:
 
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+<h2>Games built with qcge</h2>
+
+Two full games already run on qcge - same engine, very different genres - both playable in the browser (no install) and open-source:
+
+- **Quantum Breakout** - a quantum re-imagining of Atari's *Breakout*: your paddle is a multi-qubit state and you steer it by building a quantum circuit, learning superposition, measurement/collapse, phase, and entanglement one level at a time.
+  ▶ Play: https://ashmitjsg.itch.io/quantum-breakout · Source: https://github.com/ashmitjsg/Quantum-Breakout
+- **QuantaVania** - an action-adventure platformer where you build real quantum circuits to fight through each level; enemies carry quantum states and you measure your circuit to match/counter them.
+  ▶ Play: https://ashmitjsg.itch.io/quantavania · Source: https://github.com/ashmitjsg/QuantaVania
+
+Both use the exact same circuit engine (real Qiskit on desktop, the pure-Python simulator in the browser), which shows how qcge lets you add quantum controls to any pygame game without writing quantum programs from scratch.
+
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 <h2>Roadmap</h2>