Merge pull request #11 from devshah-LT24/master

Update README.md (set command updated for windows)

Author: salmanlt

README.md

@@ -60,7 +60,8 @@ Set LambdaTest `Username` and `Access Key` in environment variables.
   ```
   * For **Windows**:
   ```bash
-  set LT_USERNAME="YOUR_USERNAME" set LT_ACCESS_KEY="YOUR ACCESS KEY"
+$env:LT_USERNAME='YOUR USERNAME'
+$env:LT_ACCESS_KEY='YOUR ACCESS KEY'
   ```
 
 ## Run Your First Test