Update README.md

Author: MartinOtter

README.md

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 The [Modia Tutorial](https://modiasim.github.io/Modia.jl/stable/tutorial/GettingStarted.html) provides an introduction to Modia.
 The [Modia3D Tutorial](https://modiasim.github.io/Modia3D.jl/stable/tutorial/GettingStarted.html) provides an introduction to use 3D components in Modia. Modia is part of [ModiaSim](https://modiasim.github.io/docs/).
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 [Modia](https://github.com/ModiaSim/Modia.jl) is an environment in form of a Julia package to model and simulate physical systems (electrical, mechanical, thermo-dynamical, etc.) described by differential and algebraic equations. A user defines a model on a high level with model components (like a mechanical body, an electrical resistance, or a pipe) that are physically connected together. A model component is constructed by **`expression = expression` equations** or by Julia structs/functions, such as the pre-defined [Modia3D](https://github.com/ModiaSim/Modia3D.jl) multibody components. The defined model is symbolically processed (for example, equations might be analytically differentiated) with algorithms from package [ModiaBase.jl](https://github.com/ModiaSim/ModiaBase.jl). From the transformed model a Julia function is generated that is used to simulate the model with integrators from [DifferentialEquations.jl](https://github.com/SciML/DifferentialEquations.jl).
 
 The basic type of the floating point variables is usually *Float64*, but can be set to any type *FloatType <: AbstractFloat* via\