Merge branch 'add/license' into 'master'

Add license file

See merge request !3
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  Test
passed #3593
PHPCS

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PHPunit:PHP5.3:MySQL

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passed #3588
PHPunit:PHP5.6:MySQL

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passed #3589
PHPunit:PHP7.0:MySQL

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passed #3590
PHPunit:PHP7.1:MySQL

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passed #3591
PHPunit:PHP7.2:MySQL

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passed #3592
PHPunit:PHP7.3:MySQL

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PluginSVN

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