MAINTAINERS: add task_wdt maintainer

Add myself (original author) as the maintainer of the task watchdog.

Also including myself as a collaborator to the hardware watchdog
driver, as task watchdog and hardware watchdog are closely related.

Signed-off-by: Martin Jäger <martin@libre.solar>

MAINTAINERS.yml

@@ -895,6 +895,7 @@ Documentation:
     status: orphaned
     collaborators:
         - katsuster
+        - martinjaeger
     files:
         - doc/reference/peripherals/watchdog.rst
         - drivers/watchdog/
@@ -1589,6 +1590,17 @@ Storage:
     labels:
         - "area: Storage"
 
+Task Watchdog:
+    status: maintained
+    maintainers:
+        - martinjaeger
+    files:
+        - include/task_wdt/
+        - samples/subsys/task_wdt/
+        - subsys/task_wdt/
+    labels:
+        - "area: Task Watchdog"
+
 TF-M Integration:
     status: maintained
     maintainers: