Add tasks for all the new languages

Task/Multiple-distinct-objects/Nim/multiple-distinct-objects-1.nim

@@ -0,0 +1,7 @@
+proc foo(): string =
+  echo "Foo()"
+  "mystring"
+
+let n = 100
+var ws = newSeq[string](n)
+for i in 0 .. <n: ws[i] = foo()

Task/Multiple-distinct-objects/Nim/multiple-distinct-objects-2.nim

@@ -0,0 +1,6 @@
+proc newSeqWith[T](len: int, init: T): seq[T] =
+  result = newSeq[T] len
+  for i in 0 .. <len:
+    result[i] = init
+
+var xs = newSeqWith(n, foo())

Task/Multiple-distinct-objects/Nim/multiple-distinct-objects-3.nim

@@ -0,0 +1,7 @@
+template newSeqWith2(len: int, init: expr): expr =
+  var result {.gensym.} = newSeq[type(init)](len)
+  for i in 0 .. <len:
+    result[i] = init
+  result
+
+var ys = newSeqWith2(n, foo())