[pyassimp] Renamed the 3d for better clarity + added a short README

port/PyAssimp/scripts/README.md

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+pyassimp examples
+=================
+
+- `sample.py`: shows how to load a model with pyassimp, and display some statistics.
+- `3d_viewer.py`: an OpenGL 3D viewer that requires shaders
+- `fixed_pipeline_3d_viewer`: an OpenGL 3D viewer using the old fixed-pipeline.
+  Only for illustration example. Base new projects on `3d_viewer.py`.
+
+
+Requirements for the 3D viewers:
+
+- `pyopengl` (on Ubuntu/Debian, `sudo apt-get install python-opengl`)
+- `pygame` (on Ubuntu/Debian, `sudo apt-get install python-pygame`)