tskill: add page (#3505)

Might be worth to mention this command was removed from windows 10, and unlike taskkill, does not require the .exe extension when terminating processes.

pages/windows/tskill.md

@@ -0,0 +1,12 @@
+# tskill
+
+> Ends a process running in a session on a Remote Desktop Session Host.
+> More information: <https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/tskill>.
+
+- Terminate a process by its process identifier:
+
+`tskill {{process_id}}`
+
+- Terminate a process by its name:
+
+`tskill {{process_name}}`