Tests

Add MIT LICENSE.md to sublibraries for registration #398

Job	Run time
Tests (1, nopre) / Tests - nopre	5m 33s
Tests (lts, nopre) / Tests - nopre	4m 22s
Tests (pre, Core) / Tests - Core	5m 16s
Tests (pre, Downstream) / Tests - Downstream	2m 21s
Tests (1, Core) / Tests - Core	5m 38s
Tests (1, Downstream) / Tests - Downstream	1m 41s
Tests (lts, Downstream) / Tests - Downstream	1m 16s
Tests (lts, Core) / Tests - Core	1h 10m 2s
	1h 36m 9s

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