Add a pull request template which contains helpful information #515

Job	Run time
PHPUnit Composer v2 (PHP 7.4)	36s
PHPUnit coverage (PHP 7.4)	50s
PHPUnit (PHP 7.2)	29s
PHPUnit (PHP 7.3)	24s
PHPUnit (PHP 7.4)	20s
PHPUnit (PHP 8.0)	26s
PHPUnit (PHP 8.1)	19s
PHPUnit (PHP 8.2)	27s
PHPUnit (PHP 8.3)	44s
PHPUnit (PHP 7.1)	32s
Tests alternative autoloader (PHP 7.1)	11s
Tests alternative autoloader (PHP 7.2)	9s
Tests alternative autoloader (PHP 7.3)	11s
Tests alternative autoloader (PHP 7.4)	9s
Tests alternative autoloader (PHP 8.0)	12s
Tests alternative autoloader (PHP 8.1)	8s
Tests alternative autoloader (PHP 8.2)	7s
Tests alternative autoloader (PHP 8.3)	30s
PHPUnit lowest deps (PHP 7.3)	24s
Windows-Tests with PHP 7.1	1m 1s
Windows-Tests with PHP 7.2	55s
Windows-Tests with PHP 7.3	54s
Windows-Tests with PHP 7.4	1m 0s
Windows-Tests with PHP 8.0	50s
Windows-Tests with PHP 8.1	57s
Windows-Tests with PHP 8.2	59s
Windows-Tests with PHP 8.3	45s
	14m 29s

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