Add chapter for csv guidance.

[robertlipe]

Add chapter to guid people to proper csv variation.

[codacy-production[bot]]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
:white_check_mark: +0.01%	:white_check_mark: 100.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (6d54f2319cc5439a4d7424053928ac9513a7156e)	27929	17545	62.82%
Head commit (4d3dcbdca8eac1a2d801982ad902c0b4a1e56b01)	55867 (+27938)	35099 (+17554)	62.83% (+0.01%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#1450)	1	1	100.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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