feat: subject of ReverseSecondHalf

subjects/reversesecondhalf/README.md

@@ -0,0 +1,42 @@
+# ReverseSecondHalf
+
+### Instructions
+Write a function `ReverseSecondHalf()` that takes a string as an argument and prints the second half reversed. If the length of the string is odd, round it up.
+
+- Prints the second half reversed followed by newline `\n`.
+- if the string is empty, return `Invalid Output`.
+- If the string's length equals one, return it, followed by newline `\n`.
+
+### Expected function
+
+```go
+func ReverseSecondHalf(str string) string {
+}
+```
+
+### Usage
+
+Here is a possible program to test your function:
+
+```go
+package main
+
+import (
+	"fmt"
+)
+
+func main() {
+    ReverseSecondHalf("This is the 1st half This is the 2nd half")
+    ReverseSecondHalf("")
+    ReverseSecondHalf("Hello World")
+}
+```
+
+And its output :
+
+```go
+$ go run . | cat -e
+flah dn2 eht si sihT$
+Invalid Output$
+dlroW$
+```