Add a pull request template which contains helpful information #507

Job	Run time
PHPUnit coverage (PHP 7.4)	1m 2s
PHPUnit Composer v2 (PHP 7.4)	18s
PHPUnit (PHP 7.1)	24s
PHPUnit (PHP 7.2)	31s
PHPUnit (PHP 7.3)	21s
PHPUnit (PHP 7.4)	28s
PHPUnit (PHP 8.0)	32s
PHPUnit (PHP 8.1)	30s
PHPUnit (PHP 8.2)	19s
PHPUnit (PHP 8.3)	53s
Tests alternative autoloader (PHP 7.1)	8s
Tests alternative autoloader (PHP 7.2)	8s
Tests alternative autoloader (PHP 7.3)	8s
Tests alternative autoloader (PHP 7.4)	10s
Tests alternative autoloader (PHP 8.0)	7s
Tests alternative autoloader (PHP 8.1)	6s
Tests alternative autoloader (PHP 8.2)	7s
Tests alternative autoloader (PHP 8.3)	27s
PHPUnit lowest deps (PHP 7.3)	35s
Windows-Tests with PHP 7.1	1m 12s
Windows-Tests with PHP 7.2	55s
Windows-Tests with PHP 7.3	52s
Windows-Tests with PHP 7.4	44s
Windows-Tests with PHP 8.0	58s
Windows-Tests with PHP 8.1	56s
Windows-Tests with PHP 8.2	54s
Windows-Tests with PHP 8.3	53s
	14m 38s

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