Add a pull request template which contains helpful information #506

Job	Run time
Tests alternative autoloader (PHP 7.1)	10s
Tests alternative autoloader (PHP 7.2)	11s
Tests alternative autoloader (PHP 7.3)	14s
Tests alternative autoloader (PHP 7.4)	7s
Tests alternative autoloader (PHP 8.0)	7s
Tests alternative autoloader (PHP 8.1)	6s
Tests alternative autoloader (PHP 8.2)	10s
Tests alternative autoloader (PHP 8.3)	28s
PHPUnit (PHP 7.2)	21s
PHPUnit (PHP 7.3)	20s
PHPUnit (PHP 7.4)	26s
PHPUnit (PHP 8.0)	23s
PHPUnit (PHP 8.1)	38s
PHPUnit (PHP 8.2)	30s
PHPUnit (PHP 8.3)	57s
PHPUnit Composer v2 (PHP 7.4)	19s
PHPUnit coverage (PHP 7.4)	1m 3s
PHPUnit (PHP 7.1)	26s
PHPUnit lowest deps (PHP 7.3)	31s
Windows-Tests with PHP 7.1	1m 3s
Windows-Tests with PHP 7.2	46s
Windows-Tests with PHP 7.3	55s
Windows-Tests with PHP 7.4	1m 16s
Windows-Tests with PHP 8.0	1m 4s
Windows-Tests with PHP 8.1	1m 25s
Windows-Tests with PHP 8.2	53s
Windows-Tests with PHP 8.3	59s
	15m 48s

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