Add tasks for all the new languages

Task/Fibonacci-sequence/NGS/fibonacci-sequence.ngs

@@ -0,0 +1,11 @@
+F fib(n:Int) {
+	n < 2 returns n
+	local a = 1, b = 1
+	# i is automatically local because of for()
+	for(i=2; i<n; i=i+1) {
+		local next = a + b
+		a = b
+		b = next
+	}
+	b
+}