Add OpenRocket simulation accuracy comparison

[SiboVG]

A lot of users doubt the accuracy of OpenRocket, hell even we do sometimes. It would be really helpful if we would add a small section on the comparison of OpenRocket to other software (RockSim, RASAero), some real flight data, CFD analysis etc. Similar to RASAero: https://www.rasaero.com/comparisons-alt.htm.