Add documentations

[ErikQQY]

Fix: #173

Add individual documentation page for BoundaryValueDiffEq.jl

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Benchmark Results

	master	3596d6f...	master/3596d6f02b1084...
Simple Pendulum/IIP/BoundaryValueDiffEqMIRK.MIRK2()	6.57 ± 0.17 ms	6.57 ± 0.19 ms	0.999
Simple Pendulum/IIP/BoundaryValueDiffEqMIRK.MIRK3()	2.53 ± 0.12 ms	2.51 ± 0.11 ms	1.01
Simple Pendulum/IIP/BoundaryValueDiffEqMIRK.MIRK4()	0.902 ± 0.06 ms	0.896 ± 0.06 ms	1.01
Simple Pendulum/IIP/BoundaryValueDiffEqMIRK.MIRK5()	2.52 ± 0.42 ms	2.47 ± 0.31 ms	1.02
Simple Pendulum/IIP/BoundaryValueDiffEqMIRK.MIRK6()	1.07 ± 0.11 ms	1.06 ± 0.099 ms	1.01
Simple Pendulum/IIP/MultipleShooting(10, Tsit5; grid_coarsening = false)	1.96 ± 0.56 ms	1.97 ± 0.57 ms	0.998
Simple Pendulum/IIP/MultipleShooting(10, Tsit5; grid_coarsening = true)	3.55 ± 0.85 ms	3.56 ± 0.84 ms	0.997
Simple Pendulum/IIP/MultipleShooting(100, Tsit5; grid_coarsening = false)	0.0529 ± 0.0096 s	0.0539 ± 0.0072 s	0.981
Simple Pendulum/IIP/MultipleShooting(100, Tsit5; grid_coarsening = true)	0.0672 ± 0.016 s	0.0659 ± 0.014 s	1.02
Simple Pendulum/IIP/Shooting(Tsit5())	0.25 ± 0.077 ms	0.243 ± 0.074 ms	1.03
Simple Pendulum/OOP/BoundaryValueDiffEqMIRK.MIRK2()	0.0384 ± 0.00091 s	0.0391 ± 0.00093 s	0.982
Simple Pendulum/OOP/BoundaryValueDiffEqMIRK.MIRK3()	11.3 ± 0.5 ms	11.4 ± 0.46 ms	0.99
Simple Pendulum/OOP/BoundaryValueDiffEqMIRK.MIRK4()	3.28 ± 0.2 ms	3.34 ± 0.2 ms	0.983
Simple Pendulum/OOP/BoundaryValueDiffEqMIRK.MIRK5()	9.71 ± 0.88 ms	9.84 ± 0.84 ms	0.987
Simple Pendulum/OOP/BoundaryValueDiffEqMIRK.MIRK6()	3.49 ± 0.28 ms	3.56 ± 0.25 ms	0.981
Simple Pendulum/OOP/MultipleShooting(10, Tsit5; grid_coarsening = false)	3.42 ± 2.6 ms	3.4 ± 2.6 ms	1
Simple Pendulum/OOP/MultipleShooting(10, Tsit5; grid_coarsening = true)	6.06 ± 4.3 ms	6.06 ± 4.2 ms	1
Simple Pendulum/OOP/MultipleShooting(100, Tsit5; grid_coarsening = false)	0.101 ± 0.0029 s	0.103 ± 0.013 s	0.986
Simple Pendulum/OOP/MultipleShooting(100, Tsit5; grid_coarsening = true)	0.123 ± 0.0095 s	0.123 ± 0.012 s	0.999
Simple Pendulum/OOP/Shooting(Tsit5())	0.611 ± 0.04 ms	0.612 ± 0.048 ms	0.998
time_to_load	5.72 ± 0.042 s	5.48 ± 0.09 s	1.04

Benchmark Plots

A plot of the benchmark results have been uploaded as an artifact to the workflow run for this PR.
Go to "Actions"->"Benchmark a pull request"->[the most recent run]->"Artifacts" (at the bottom).