Write readme for delete subject

subjects/delete/README.md

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+## delete
+
+### Instructions
+
+Write a function that removes the element at a given position of a slice of ints. It should return a new slice with the result. If the position is out of range, it should return the original slice.
+
+### Expected function
+
+```go
+func Delete(ints []int, position int) []int {
+}
+```
+
+### Usage
+
+Here is a possible program to test your function :
+
+```go
+package main
+
+import (
+    "piscine"
+    "fmt"
+)
+
+func main() {
+	fmt.Println(piscine.Delete([1, 2, 3, 4, 5], 2))
+	fmt.Println(piscine.Delete([1, 2, 3, 4, 5], 3))
+	fmt.Println(piscine.Delete([1, 2, 3, 4, 5], 1))
+}
+```
+
+And its output :
+
+```console
+$ go run . | cat -e
+[1 3 4 5]$
+[1 2 4 5]$
+[2 3 4 5]$
+```