adds note about running cli in windows

Author: angelazhou32

exercises/hello-workflow/README.md

@@ -64,10 +64,22 @@ $ temporal workflow start \
     --workflow-id my-first-workflow \
     --input '"Mason"'
 ```
+Notice the quoting for the input value, which has double quotes inside of single quotes. The input passed to the `temporal` command must be provided in JSON format and the quoting used here is necessary to pass the value through the shell and into the Workflow in the correct format.
 
 Note that this command starts the Workflow, but it does not wait for it to complete or show the result.
+
 If you have time, continue with the optional part of the exercise below to see how to view the result using `temporal`.
 
+### Using the CLI to Start a Workflow with Windows
+
+The mix of single and double quotes we currently have pertains to UNIX-style shells. However, If you are running the Temporal CLI in Windows (such as Powershell), you will need to use Windows-style quote escaping like this:
+
+```
+temporal workflow start --type GreetSomeone --task-queue greeting-tasks --workflow-id my-first-workflow --input '\"Mason\"'
+```
+
+This is a general Windows approach for handling quotes in parameters, not something specific to Temporal.
+
 ## Part E (Optional): Display the Result
 
 You can run the following command to display the result of a Workflow Execution: