add subject

subjects/reversestrings/READMED.md

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+## reverse-strings
+
+### Instructions
+
+Write a function that takes a slice of strings and returns a single string containing them in reverse order with a space between each element of the slice,if the slice is empty, return an empty string.
+
+### Expected function
+
+```go
+func ReverseStrings(strs []string) string {
+
+}
+```
+
+### Usage
+
+Here is a possible program to test your function:
+
+```go 
+package main
+
+import "fmt"
+
+func main(){
+    fmt.Println(ReverseStrings([]string{"a", "b", "c"}))
+    fmt.Println(ReverseStrings([]string{"Good","Morning!"}))
+    fmt.Println(ReverseStrings([]string{"Hello World"}))
+}
+```
+
+And its output : 
+
+```console
+$ go run .
+c b a
+!gninroM dooG
+dlroW olleH
+```