Add a pull request template which contains helpful information (#633) #521

Job	Run time
PHPUnit Composer v2 (PHP 7.4)	20s
PHPUnit (PHP 7.2)	24s
PHPUnit (PHP 7.3)	21s
PHPUnit (PHP 7.4)	19s
PHPUnit (PHP 8.0)	20s
PHPUnit (PHP 8.1)	27s
PHPUnit (PHP 8.2)	19s
PHPUnit (PHP 8.3)	42s
PHPUnit (PHP 7.1)	30s
Tests alternative autoloader (PHP 7.1)	7s
Tests alternative autoloader (PHP 7.2)	11s
Tests alternative autoloader (PHP 7.3)	9s
Tests alternative autoloader (PHP 7.4)	10s
Tests alternative autoloader (PHP 8.0)	8s
Tests alternative autoloader (PHP 8.1)	7s
Tests alternative autoloader (PHP 8.2)	12s
Tests alternative autoloader (PHP 8.3)	33s
PHPUnit coverage (PHP 7.4)	1m 0s
PHPUnit lowest deps (PHP 7.3)	27s
Windows-Tests with PHP 7.1	58s
Windows-Tests with PHP 7.2	47s
Windows-Tests with PHP 7.3	47s
Windows-Tests with PHP 7.4	44s
Windows-Tests with PHP 8.0	43s
Windows-Tests with PHP 8.1	45s
Windows-Tests with PHP 8.2	58s
Windows-Tests with PHP 8.3	41s
	13m 9s

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