Add meta-files for yiisoft/yii2-framework [skip ci]

framework/.github/CONTRIBUTING.md

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+Contributing to Yii 2
+=====================
+
+Please use [yiisoft/yii2](https://github.com/yiisoft/yii2) to report issues and send pull requests. Thank you!

framework/.github/FUNDING.yml

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+# These are supported funding model platforms
+
+open_collective: yiisoft
+github: [yiisoft]
+tidelift: "packagist/yiisoft/yii2"

framework/.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+Please use https://github.com/yiisoft/yii2 to report issues and send pull requests. Thank you!
+-->

framework/.github/SECURITY.md

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+# Security Policy
+
+Please use the [security issue form](https://www.yiiframework.com/security) to report to us any security issue you find in Yii.
+DO NOT use the issue tracker or discuss it in the public forum as it will cause more damage than help.
+
+Please note that as a non-commerial OpenSource project we are not able to pay bounties at the moment.