Add docs for v1 to v2 migration #303

Job	Run time
Lint root / Lint yaml & Composer (8.0)	14s
Code Coverage / Code Coverage	16s
Static analysis / Static Code Analysis (8.0)	23s
Dependency analysis / Dependency Analysis (8.0)	17s
Unit test / Supported Versions Matrix	6s
Coding Standards / Coding Standards (8.0)	21s
Unit test / Tests (7.4, lowest)	20s
Unit test / Tests (7.4, locked)	16s
Unit test / Tests (7.4, highest)	23s
Unit test / Tests (8.0, locked)	13s
Unit test / Tests (8.0, lowest)	21s
Unit test / Tests (8.0, highest)	24s
Unit test / Tests (8.1, locked)	22s
Unit test / Tests (8.1, highest)	21s
Unit test / Tests (8.2, lowest)	30s
Unit test / Tests (8.2, highest)	24s
Unit test / Tests (8.1, lowest)	25s
Unit test / Tests (8.3, locked)	17s
Unit test / Tests (8.2, locked)	17s
Unit test / Tests (8.3, lowest)	21s
Unit test / Tests (8.5, lowest)	24s
Unit test / Tests (8.4, highest)	29s
Unit test / Tests (8.4, lowest)	23s
Unit test / Tests (8.5, highest)	23s
Unit test / Tests (8.3, highest)	25s
Unit test / Tests (8.5, locked)	19s
Unit test / Tests (8.4, locked)	14s
	9m 8s

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