Readme added #64

Job	Run time
GitHub Action	10s
Docker	1m 11s
Linters (8.1)	53s
Phar (8.1)	36s
Linters (8.2)	44s
PHPUnit (8.1, xdebug, --prefer-lowest)	22s
Reports (8.1)	30s
Linters (8.3)	52s
Phar (8.2)	32s
PHPUnit (8.1, xdebug)	31s
Phar (8.3)	31s
PHPUnit (8.1, none, --prefer-lowest)	30s
Reports (8.2)	53s
PHPUnit (8.1, none)	17s
Reports (8.3)	34s
PHPUnit (8.2, xdebug, --prefer-lowest)	30s
PHPUnit (8.2, xdebug)	21s
PHPUnit (8.2, none, --prefer-lowest)	17s
PHPUnit (8.2, none)	26s
PHPUnit (8.3, xdebug, --prefer-lowest)	7s
PHPUnit (8.3, xdebug)	5s
PHPUnit (8.3, none, --prefer-lowest)	7s
PHPUnit (8.3, none)	1s
	11m 0s

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