Add ESC-to-clear keybind to "Coming from CMD" and "Coming from PowerShell" pages (#2136)

Author: LikeLakers2

book/coming_from_cmd.md

@@ -73,3 +73,19 @@ Executing `./ver` or `ver.bat` *will* execute the local bat file though.
 
 Note that Nushell has its own [`start` command](/commands/docs/start.md) which takes precedence.
 You can call the CMD.EXE's internal `START` command with the external command syntax `^start`.
+
+## Clearing the commandline buffer by pressing ESC
+
+CMD.EXE features the ability to clear the commandline buffer by pressing the ESC key.
+
+While Nu does not replicate this by default, a keybind can be added to your `config.nu` to enable similar functionality:
+
+```nu
+$env.config.keybindings ++= [{
+    name: 'esc_clear'
+    modifier: 'None'
+    keycode: 'Esc'
+    mode: ['Emacs', 'Vi_Normal']
+    event: {edit: 'Clear'}
+}]
+```

book/coming_from_powershell.md

@@ -65,3 +65,19 @@ This means:
 | `Get-Location` or `$PWD`                                          | `pwd` or `$env.PWD`                           | Show current directory                                            |
 | `Read-Host`                                                       | `let var = input`                             | Read user input                                                   |
 | `Read-Host -AsSecureString`                                       | `let secret = input -s`                       | Read secret input                                                 |
+
+## Clearing the commandline buffer by pressing ESC
+
+Legacy versions of PowerShell feature the ability to clear the commandline buffer by pressing the ESC key.
+
+While Nu does not replicate this by default, a keybind can be added to your `config.nu` to enable similar functionality:
+
+```nu
+$env.config.keybindings ++= [{
+    name: 'esc_clear'
+    modifier: 'None'
+    keycode: 'Esc'
+    mode: ['Emacs', 'Vi_Normal']
+    event: {edit: 'Clear'}
+}]
+```