Added test case

tests/stdlib/tosprocterminate.nim

@@ -0,0 +1,21 @@
+import os, osproc
+
+when defined(Windows):
+  const ProgramWhichDoesNotEnd = "notepad"
+else:
+  const ProgramWhichDoesNotEnd = "/bin/sh"
+
+echo("starting " & ProgramWhichDoesNotEnd)
+var process = startProcess(ProgramWhichDoesNotEnd)
+sleep(500)
+echo("stopping process")
+process.terminate()
+var TimeToWait = 5000
+while process.running() and TimeToWait > 0:
+  sleep(100)
+  TimeToWait = TimeToWait - 100
+  
+if process.running():
+  echo("FAILED")
+else:
+  echo("SUCCESS")