Update readme.md with error message info and fix.

readme.md

@@ -29,4 +29,18 @@ To check the ip address of your docker machine:
 
 ```bash
        docker-machine ip default
+```
+
+On Windows, if you get the error:
+
+```bash
+        un\\\\docker.sock:/var/run/docker.sock"\nis not a valid Windows path'
+
+ERROR: for portainer  Cannot create container for service portainer: b'Mount denied:\nThe source path "\\\\var\\\\run\\\\docker.sock:/var/run/docker.sock"\nis not a valid Windows path'
+Encountered errors while bringing up the project.
+```
+
+You will need to use Windows Powershell (as Admin) and enter:
+```bash
+        $Env:COMPOSE_CONVERT_WINDOWS_PATHS=1
 ```
\ No newline at end of file