Update README.md [skip ci]
Update structure-extensions.md
add structure-controllers.md [UK]
Merge pull request #5939 from pana1990/guide-es

Update README.md [skip ci]
Merge pull request #5940 from aminking2005/patch-4

Update structure-extensions.md [ci skip]
Merge pull request #5941 from RichWeber/master

[skip ci] add structure-controllers.md [UK]
Add docs/guide-ja/caching-*.md [ci skip]
Added support for 'findAndModify' operation at `yii\mongodb\Query` and `yii\mongodb\ActiveQuery`
Merge pull request #5946 from jamband/add-docs-ja

Add docs/guide-ja/caching-*.md [ci skip]