Create README.md

Author: TimGoTheCreator

examples/TwoBodies/README.md

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+### Two‑Body System Demo
+
+This example builds a simple **two‑body gravitational system** by hand.  
+One massive body is placed at the origin, and a lighter body is positioned at distance `5` with an initial tangential velocity, forming an orbital pair.
+
+### Running this example from this directory
+
+```bash
+python two_body.py
+../../next two_body.txt 0.01 1
+```