Add CSM introduction for the new tutorial series

[vhirtham]

Changes

Adds a new Jupyter notebook that introduces the CoordinateSystemManager. This is part of the new tutorial series.

Checks

• [x] updated CHANGELOG.rst
• [x] updated tests
• [x] updated doc/
• [x] update example/tutorial notebooks
• [x] update manifest file

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Test Results

2 185 tests  ±0   2 184 :heavy_check_mark: ±0   3m 36s :stopwatch: +56s        1 suites ±0          1 :zzz: ±0         1 files   ±0          0 :x: ±0 

Results for commit 306826c1. ± Comparison against base commit 5deeeebc.

:recycle: This comment has been updated with latest results.

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@5deeeeb). Click here to learn what that means. The diff coverage is n/a.

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  Hits              ?     5837           
  Misses            ?      188           
  Partials          ?        0           

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[vhirtham]

verbally approved by @CagtayFabry :)