Add living ASCII universe simulation

[raza-khan0108]

This pull request adds a procedural ASCII-based universe simulation written in C++. The program models a simple star system where stars are randomly generated, age over time, respond to a gravity-like force toward the center, and are removed once they exceed their lifespan. The simulation runs continuously and renders the evolving state in real time using terminal output.

The goal of this change is to demonstrate creative, simulation-oriented C++ programming beyond traditional data-structure or problem-solving examples, highlighting real-time updates, randomness, and system behavior.