added redirect master file

Author: scooley

.openpublishing.redirection.json

@@ -0,0 +1,9 @@
+{ 
+    "redirections": [ 
+      {
+         "source_path": "wsl/install_guide.md",
+         "redirect_url": "/wsl/install-win10",
+         "redirect_document_id": true
+      }
+    ] 
+}