初始化代码

vendor/psr/cache/README.md

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+PSR Cache
+=========
+
+This repository holds all interfaces defined by
+[PSR-6](http://www.php-fig.org/psr/psr-6/).
+
+Note that this is not a Cache implementation of its own. It is merely an
+interface that describes a Cache implementation. See the specification for more 
+details.