Added meta file for new XR dir

com.unity.render-pipelines.core/CoreRP/XR.meta

+fileFormatVersion: 2
+guid: 3f48c5fcf83adee4e815baff4b216f60
+folderAsset: yes
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: