Add a tutorial for using the progress bar (#704)

As noted in #514 

closes #514

xref microsoft/terminal#6700

Author: zadjii-msft

TerminalDocs/TOC.yml

@@ -1,5 +1,5 @@
 - name: Windows Terminal
-  items: 
+  items:
     - name: Overview
       href: index.md
     - name: Install
@@ -56,6 +56,8 @@
           href: tutorials/tab-title.md
         - name: Open tab or pane in same directory
           href: tutorials/new-tab-same-directory.md
+        - name: Set the progress bar
+          href: tutorials/progress-bar-sequences.md
     - name: Custom Terminal gallery
       items:
         - name: Custom Terminal guide
@@ -74,4 +76,4 @@
       href: troubleshooting.md
 
 
-    
+

TerminalDocs/tutorials/progress-bar-sequences.md

@@ -0,0 +1,89 @@
+---
+title: Set the progress bar in the Windows Terminal
+description: In this tutorial, you learn how to use the progress bar sequences in the Windows Terminal.
+author: zadjii-msft
+ms.author: migrie
+ms.date: 08/31/2023
+ms.topic: tutorial
+#Customer intent: As a developer or IT admin, I want to use the progress bar sequences in the Windows Terminal so that I can see the progress of a long-running command.
+---
+
+# Tutorial: Set the progress bar in the Windows Terminal
+
+The Windows Terminal supports the ConEmu "Progress Bar" sequences, also known as "OSC 9;4". These sequences allow a command-line application to display a progress bar in the terminal window. This is useful for long-running commands, such as copying large files or deploying applications.
+
+In the Windows Terminal, the progress bar is displayed in  two places:
+* In the tab header, as a progress ring
+* In the Windows taskbar, in the same manner as a download progress bar.
+
+![An example of what the progress ring it the tab header looks like](https://devblogs.microsoft.com/commandline/wp-content/uploads/sites/33/2021/01/progress-ring.gif)
+
+## Prerequisites
+
+* Windows Terminal v1.6 or later.
+* For the taskbar animation, you'll need to make sure "Show animations in Windows" is enabled in "Settings / Ease of Access / Display".
+
+
+## Progress bar sequence format
+
+To set the progress bar, you need to send the OSC 9;4 sequence to the terminal. This sequence has the following format:
+
+```text
+
+ESC ] 9 ; 4 ; <state> ; <progress> BEL
+
+```
+
+* `ESC` is the escape character, ASCII 27.
+* `BEL` is the bell character, ASCII 7.
+* `<state>` is one of `0`, `1`, `2`, `3`, or `4`.
+  * `0` is the default state, and indicates that the progress bar should be hidden. Use this state when the command is complete, to clear out any progress state.
+  * `1`: set progress value to `<progress>`, in the "default" state.
+  * `2`: set progress value to `<progress>`, in the "Error" state
+  * `3`: set the taskbar to the "Indeterminate" state. This is useful for commands that don't have a progress value, but are still running. This state ignores the `<progress>` value.
+  * `4`: set progress value to `<progress>`, in the "Warning" state
+* `<progress>` is a number between 0 and 100, inclusive.
+
+## Examples
+
+### PowerShell
+
+```powershell
+# Set the progress bar to 50%
+Write-Host -NoNewline ([char]27 + "]9;4;1;50" + [char]7)
+```
+
+Or, alternatively, in PowerShell 7:
+
+```powershell
+# Set the progress bar to 50%
+Write-Host -NoNewline ("`e]9;4;1;50`a")
+```
+
+### Bash
+
+```bash
+# Set the progress bar to 50%
+echo -ne "\033]9;4;1;50\a"
+```
+
+### C#
+
+```csharp
+// Set the progress bar to 50%
+Console.Write("\x1b]9;4;1;50\x07");
+```
+
+### Command Prompt
+
+Command Prompt is a little trickier, since it doesn't have great support for escape sequences. You can use the `echo` command to send the escape sequence, but you'll need to use literal ESC and BEL characters in the file. These might be rendered as boxes in the web browser, but they should work in the terminal.
+
+```bat
+<NUL set /p =]9;4;1;50
+echo Started progress (normal, 50)
+```
+
+The above example uses the `NUL` device to write the escape sequence to the console without a newline.
+
+> **Note**:
+> Don't see your favorite shell here? If you figure it out, feel free to [to contribute a solution for your preferred shell!](https://github.com/MicrosoftDocs/terminal/compare)