Add tasks for all the new languages

Task/Function-prototype/Nim/function-prototype.nim

@@ -0,0 +1,17 @@
+# Procedure declarations. All are named
+proc noargs(): int
+proc twoargs(a, b: int): int
+proc anyargs(x: varargs[int]): int
+proc optargs(a, b: int = 10): int
+
+# Usage
+discard noargs()
+discard twoargs(1,2)
+discard anyargs(1,2,3,4,5,6,7,8)
+discard optargs(5)
+
+# Procedure definitions
+proc noargs(): int = echo "noargs"
+proc twoargs(a, b: int): int = echo "twoargs"
+proc anyargs(x: varargs[int]): int = echo "anyargs"
+proc optargs(a: int, b = 10): int = echo "optargs"