square roost

subjects/squareroot/README.md

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+## Square-root
+
+### Instructions
+Write a function that takes a number and returns the square root of that number.
+- The square root of a number is the number divided by two until the number is less than or equal to one.
+- If the number is less than zero return `-1`.
+
+### Expected function
+```go
+func SquareRoot(number int) int {
+    // Your code here
+}
+```
+
+### Usage
+
+Here is a possible program to test your function:
+
+```go
+package main
+
+import (
+    "fmt"
+    "piscine"
+
+func main() {
+    fmt.Println(piscine.SquareRoot(9))
+    fmt.Println(piscine.SquareRoot(16))
+    fmt.Println(piscine.SquareRoot(25))
+    fmt.Println(piscine.SquareRoot(26))
+    fmt.Println(piscine.SquareRoot(0))
+	fmt.Println(piscine.SquareRoot(-1))
+	fmt.Println(piscine.SquareRoot(1))
+}
+```
+
+and the output should be:
+
+```console
+$ go run . 
+3
+4
+5
+5
+0
+-1
+1
+```