DEV-3378-new-go-exercise-quarterofayear (#1525)

* docs(quarterofayear): add README.md for new go exam exercise

* docs(quarterofayear): instructions upgrade

---------

Co-authored-by: Tiago Collot <>

subjects/quarterofayear/README.md

@@ -0,0 +1,50 @@
+## quarterofayear
+
+### Instructions
+
+Write a function `QuarterOfAYear()` that takes an `int`, from 1 to 12, as an argument and returns an `int` with the respective quarter of the year to which it belongs.
+
+- If the number is not between 1 and 12 return `-1`.
+
+
+### Expected function
+
+```go
+func QuarterOfAYear(month int) int {
+
+}
+```
+
+### Usage
+
+Here is a possible program to test your function:
+
+```go
+package main
+
+import (
+	"fmt"
+	"piscine"
+)
+
+func main() {
+	fmt.Println(piscine.QuarterOfAYear(2))
+	fmt.Println(piscine.QuarterOfAYear(5))
+	fmt.Println(piscine.QuarterOfAYear(9))
+	fmt.Println(piscine.QuarterOfAYear(11))
+	fmt.Println(piscine.QuarterOfAYear(13))
+	fmt.Println(piscine.QuarterOfAYear(-5))
+}
+```
+
+And its output:
+
+```console
+$ go run .
+1
+2
+3
+4
+-1
+-1
+```