added readme and requirements for simulator

MAGLEV_DIGITALTWIN_PYTHON/ReadMe.md

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+# How To Use
+## Running the Simulation
+Run ```pip install -r requirements.txt``` followed by ```python topSimulate.py```. Or, if your environment is already set up, just run the python file.
+## Modifying the PID control algorithm
+Modify ```controller.py```. You will see constants related to heave, pitch, and roll controllers. Will update to include current control and will make simulation much more accurate soon.
+## Modifying pod parameters
+```parameters.py``` provides all necessary mechanical parameters. Yoke and sensor locations are matrices formed by putting together 4 column vectors of the form $\begin{bmatrix}x\\y\\z\end{bmatrix}$ relative to the center of mass. <br><br>```fmag2()``` within ```utils.py``` deals with the magnetic parameters.