Add docs for v1 to v2 migration #302

Job	Run time
Coding Standards / Coding Standards (8.0)	31s
Code Coverage / Code Coverage	59s
Dependency analysis / Dependency Analysis (8.0)	20s
Lint root / Lint yaml & Composer (8.0)	14s
Unit test / Supported Versions Matrix	3s
Static analysis / Static Code Analysis (8.0)	30s
Unit test / Tests (7.4, locked)	30s
Unit test / Tests (7.4, lowest)	45s
Unit test / Tests (8.0, lowest)	50s
Unit test / Tests (7.4, highest)	31s
Unit test / Tests (8.1, locked)	43s
Unit test / Tests (8.0, locked)	37s
Unit test / Tests (8.1, lowest)	1m 1s
Unit test / Tests (8.2, lowest)	1m 0s
Unit test / Tests (8.0, highest)	45s
Unit test / Tests (8.2, locked)	35s
Unit test / Tests (8.1, highest)	44s
Unit test / Tests (8.4, locked)	26s
Unit test / Tests (8.3, locked)	48s
Unit test / Tests (8.4, lowest)	1m 1s
Unit test / Tests (8.4, highest)	41s
Unit test / Tests (8.3, lowest)	45s
Unit test / Tests (8.3, highest)	1m 0s
Unit test / Tests (8.2, highest)	47s
Unit test / Tests (8.5, lowest)	32s
Unit test / Tests (8.5, locked)	23s
Unit test / Tests (8.5, highest)	46s
	17m 47s

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