FileSystem draft

services/filesystem.md

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+# Filesystem
+
+The file system provides a simple way to handle operations on the file system. Supported environments are `local`, `ftp`, `git` as well as `aws`. The functionality is for all environments the same.
+
+## Functions
+
+* `exists()`
+* `delete()`
+* `create()`
+* `put()`
+* `get()`
+* `size()`
+* `createdAt()`
+* `modifiedAt()`
+* `move()`
+* `copy()`
+* `list()`
+* `directories()`
+* `files()`
+
+## Custom Implementations
+
+Custom implementations can be created by implementing the FileSystemInterface. These implementations must get registered in the file system and can be used afterwards as the pre-defined implementations.
+
+```
+FileSystem::register('custom1', '\implementation\namespace');
+FileSystem::env('custom1')->list();
+```