feat: add documentation for custom-alert command

Author: MicLieg

commands/README.md

@@ -18,6 +18,7 @@ Replace `./gameserver` with the actual script name. Every command has a short ve
 | [Update LinuxGSM](update-lgsm.md)                    | `./gameserver update-lgsm`  | `./gameserver ul` |
 | [Monitor](monitor.md)                                | `./gameserver monitor`      | `./gameserver m`  |
 | [Test Alert](test-alert.md)                          | `./gameserver test-alert`   | `./gameserver ta` |
+| [Custom Alert](custom-alert.md)                      | `./gameserver custom-alert` | `./gameserver ca` |
 | [Update](update.md)                                  | `./gameserver update`       | `./gameserver u`  |
 | [Check Update](check-update.md)                      | `./gameserver check-update` | `./gameserver cu` |
 | [Force Update](force-update.md)                      | `./gameserver force-update` | `./gameserver fu` |
@@ -41,8 +42,6 @@ Replace `./gameserver` with the actual script name. Every command has a short ve
 
 ### Rust 
 
-
-
 | Command Name                        | Command                  | Short             |
 | ----------------------------------- | ------------------------ | ----------------- |
 | [Full Wipe](./#rust)                | `./rustserver full-wipe` | `./rustserver fw` |

commands/custom-alert.md

@@ -0,0 +1,23 @@
+# custom-alert
+
+The `custom-alert` command is used to send a custom alert message and provides the option to select a custom alert title.
+
+## Commands
+
+Standard: `./gameserver custom-alert`
+
+Short: `./gameserver ca`
+
+## Advanced Commands
+
+### Without Custom alert title
+
+Standard: `./gameserver custom-alert <custom alert message>`
+
+Short: `./gameserver ca <custom alert message>`
+
+### With Custom alert title
+
+Standard: `./gameserver custom-alert <custom alert message> <custom alert title>`
+
+Short: `./gameserver ca <your custom alert message> <custom alert title>`