Update README.md

Author: bhong-mw

README.md

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 ## Suggested Prework ##
 [MATLAB Onramp](https://www.mathworks.com/learn/tutorials/matlab-onramp.html) – a free two-hour introductory tutorial that teaches the essentials of MATLAB.
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 [Circuit Simulation Onramp](https://www.mathworks.com/learn/tutorials/circuit-simulation-onramp.html) – a free two-hour introductory tutorial that teaches the basics of simulating electrical circuits in Simscape.