Readme added #62

Job	Run time
Docker	1m 10s
Phar (8.1)	2m 4s
Linters (8.1)	2m 16s
Phar (8.2)	2m 6s
GitHub Action	9s
Linters (8.2)	40s
Phar (8.3)	2m 3s
PHPUnit (8.1, xdebug, --prefer-lowest)	23s
Linters (8.3)	36s
Reports (8.1)	35s
PHPUnit (8.1, xdebug)	36s
Reports (8.2)	44s
PHPUnit (8.1, none, --prefer-lowest)	35s
Reports (8.3)	36s
PHPUnit (8.1, none)	32s
PHPUnit (8.2, xdebug, --prefer-lowest)	33s
PHPUnit (8.2, xdebug)	35s
PHPUnit (8.2, none, --prefer-lowest)	26s
PHPUnit (8.2, none)	25s
PHPUnit (8.3, xdebug, --prefer-lowest)	29s
PHPUnit (8.3, xdebug)	34s
PHPUnit (8.3, none, --prefer-lowest)	34s
PHPUnit (8.3, none)	19s
	19m 0s

Provide feedback