add node modules to repo

node_modules/fs-extra/docs/emptyDir-sync.md

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+# emptyDirSync(dir)
+
+Ensures that a directory is empty. Deletes directory contents if the directory is not empty. If the directory does not exist, it is created. The directory itself is not deleted.
+
+**Alias:** `emptydirSync()`
+
+- `dir` `<String>`
+
+## Example:
+
+```js
+const fs = require('fs-extra')
+
+// assume this directory has a lot of files and folders
+fs.emptyDirSync('/tmp/some/dir')
+```