Add devdocs #40

Job	Run time
Tests (1, Extensions) / Tests - Extensions	23m 13s
Tests (1, IO) / Tests - IO	7m 38s
Tests (1, Core) / Tests - Core	25m 59s
Tests (1, Spatial) / Tests - Spatial	11m 46s
Tests (lts, Extensions) / Tests - Extensions	13m 10s
Tests (lts, Core) / Tests - Core	18m 52s
Tests (lts, IO) / Tests - IO	6m 27s
Tests (lts, Spatial) / Tests - Spatial	8m 37s
Tests (pre, Core) / Tests - Core	25m 16s
Tests (pre, Extensions) / Tests - Extensions	22m 47s
Tests (pre, IO) / Tests - IO	7m 33s
Tests (pre, Spatial) / Tests - Spatial	12m 14s
	3h 3m 32s

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