Add langs Cherrycake and Insitux

Task/Arrays/Insitux/arrays.insitux

@@ -0,0 +1,20 @@
+> (var my-list [1 2 3 4 5]) ;syntactic sugar
+[1 2 3 4 5]
+
+> (var my-list (vec 1 2 3 4 5))
+[1 2 3 4 5]
+
+> my-list
+[1 2 3 4 5]
+
+> (3 my-list) ;fourth element
+4
+
+> (-1 my-list) ;last element
+5
+
+> (append my-list 100)
+[1 2 3 4 5 100]
+
+> my-list ;variables are immutable so my-list cannot be changed without being redefined
+[1 2 3 4 5]