DEV-3187 add(docs):add subject of revconcAlter

subjects/revconcatalternate/README.md

@@ -0,0 +1,45 @@
+## Reverse-Concat-Alternate
+
+
+### Instructions
+
+- Write a function that receives two slices of int as arguments and returns a new one with the result of alternating the values of each in reverse order.
+- The input slices may be of different lengths.
+- The new slice should contain the elements of the larger slice first and then the elements of the smaller slice.
+- If the slices are of equal length, the new slice should contain the elements of the first slice first and then the elements of the second slice.
+- The new slice should be in the reverse order of the input slices.
+
+### Expected function
+
+```go
+func RevConcatAlternate(slice1,slice2 []int) []int {
+    
+}
+```
+
+### Usage
+
+Here is a possible program to test your function :
+
+```go
+package main
+
+import (
+	"fmt"
+)
+
+func main() {
+	fmt.Println(RevConcatAlternate([]int{1,2,3},[]int{4,5,6}))
+    fmt.Println(RevConcatAlternate([]int{1,2,3},[]int{4,5,6,7,8,9}))
+    fmt.Println(RevConcatAlternate([]int{1,2,3},[]int{}))
+}
+```
+
+And its output :
+
+```console
+$ go run .
+[3,6,2,5,1,4]
+[9,1,8,2,7,3,6,5,4]
+[3,2,1]
+```