Tests

Add ragged arrays documentation and README section #411

Job	Run time
Tests (1, Downstream) / Tests - Downstream	1m 26s
Tests (lts, RaggedArrays) / Tests - RaggedArrays	2m 28s
Tests (lts, ShorthandConstructors) / Tests - ShorthandConstructors	2m 0s
Tests (lts, nopre) / Tests - nopre	2m 21s
Tests (1, ArrayPartitionAnyAll) / Tests - ArrayPartitionAnyAll	2m 2s
Tests (pre, RaggedArrays) / Tests - RaggedArrays	3m 25s
Tests (1, nopre) / Tests - nopre	3m 34s
Tests (pre, Core) / Tests - Core	3m 56s
Tests (1, RaggedArrays) / Tests - RaggedArrays	3m 22s
Tests (pre, ShorthandConstructors) / Tests - ShorthandConstructors	3m 40s
Tests (pre, ArrayPartitionAnyAll) / Tests - ArrayPartitionAnyAll	1m 56s
Tests (1, ShorthandConstructors) / Tests - ShorthandConstructors	1m 42s
Tests (lts, Downstream) / Tests - Downstream	1m 6s
Tests (pre, Downstream) / Tests - Downstream	1m 41s
Tests (lts, ArrayPartitionAnyAll) / Tests - ArrayPartitionAnyAll	2m 3s
Tests (1, Core) / Tests - Core	3m 33s
Tests (lts, Core) / Tests - Core	3m 21s
	43m 36s

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