Tests

Add ragged arrays documentation and README section #412

Job	Run time
Tests (lts, Core) / Tests - Core	6m 19s
Tests (pre, Downstream) / Tests - Downstream	1m 30s
Tests (1, Core) / Tests - Core	4m 20s
Tests (pre, Core) / Tests - Core	7m 42s
Tests (lts, RaggedArrays) / Tests - RaggedArrays	2m 38s
Tests (pre, RaggedArrays) / Tests - RaggedArrays	2m 45s
Tests (1, ShorthandConstructors) / Tests - ShorthandConstructors	2m 34s
Tests (pre, ArrayPartitionAnyAll) / Tests - ArrayPartitionAnyAll	1m 32s
Tests (1, Downstream) / Tests - Downstream	1m 17s
Tests (lts, ShorthandConstructors) / Tests - ShorthandConstructors	1m 45s
Tests (1, nopre) / Tests - nopre	3m 25s
Tests (pre, ShorthandConstructors) / Tests - ShorthandConstructors	2m 17s
Tests (lts, nopre) / Tests - nopre	2m 47s
Tests (1, RaggedArrays) / Tests - RaggedArrays	3m 41s
Tests (lts, ArrayPartitionAnyAll) / Tests - ArrayPartitionAnyAll	1m 47s
Tests (lts, Downstream) / Tests - Downstream	1m 21s
Tests (1, ArrayPartitionAnyAll) / Tests - ArrayPartitionAnyAll	1m 33s
	49m 13s

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