Add tasks for all the new languages

Task/Fork/Nim/fork.nim

@@ -0,0 +1,11 @@
+import posix
+
+var pid = fork()
+if pid < 0:
+    # error forking a child
+elif pid > 0:
+    # parent, and pid is process id of child
+else:
+    # child
+    quit()
+# further Parent stuff here