add tutorial on controller tuning from experimental data

[codecov[bot]]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (dc231f0) 92.72% compared to head (1249b1c) 91.21%.

:exclamation: Current head 1249b1c differs from pull request most recent head 42d474d. Consider uploading reports for the commit 42d474d to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #883 +/- ## ========================================== - Coverage 92.72% 91.21% -1.52% ========================================== Files 5 5 Lines 330 330 ========================================== - Hits 306 301 -5 - Misses 24 29 +5 ``` [see 1 file with indirect coverage changes](https://app.codecov.io/gh/JuliaControl/ControlSystems.jl/pull/883/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaControl)

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[JuliaControlBot]

This is an automated message. Plots were compared to references. 11/11 images have changed, see differences below. After pulling this PR, please update the reference images by creating a PR to ControlExamplePlots.jl here. Difference	Reference Image	New Image
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