Adds basic READMEs to inmemory and filesystem storage drivers

storagedriver/filesystem/README.md

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+Docker-Registry Filesystem Storage Driver
+=========================================
+
+An implementation of the `storagedriver.StorageDriver` interface which uses the local filesystem.
+
+## Parameters
+
+`rootdirectory`: (optional) The root directory tree in which all registry files will be stored. Defaults to `/tmp/registry/storage`.

storagedriver/inmemory/README.md

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+Docker-Registry In-Memory Storage Driver
+=========================================
+
+An implementation of the `storagedriver.StorageDriver` interface which uses local memory for object storage.
+
+**IMPORTANT**: This storage driver *does not* persist data across runs, and primarily exists for testing.
+
+## Parameters
+
+None