restoring erased subject 'abort'

subjects/abort/README.md

@@ -0,0 +1,40 @@
+## abort
+
+### Instructions
+
+Write a function that returns the median of 5 five arguments.
+
+### Expected function
+
+```go
+func Abort(a, b, c, d, e int) int {
+
+}
+```
+
+### Usage
+
+Here is a possible program to test your function :
+
+```go
+package main
+
+import (
+	"fmt"
+	piscine ".."
+)
+
+func main() {
+	middle := piscine.Abort(2, 3, 8, 5, 7)
+	fmt.Println(middle)
+}
+```
+
+And its output :
+
+```console
+student@ubuntu:~/[[ROOT]]/test$ go build
+student@ubuntu:~/[[ROOT]]/test$ ./test
+5
+student@ubuntu:~/[[ROOT]]/test$
+```