docs: Write readme for byebyefirst subject

byebyefirst/README.md

@@ -0,0 +1,35 @@
+## byebyefirst
+
+### Instructions
+
+Write a function that takes a slice of strings and returns a new slice without the first element. If the slice is empty, return the empty slice.
+
+### Expected function
+
+```go
+func ByeByeFirst(strings []string) []string {
+}
+```
+
+### Usage
+
+Here is a possible program to test your function :
+
+```go
+package main
+
+func main() {
+	fmt.Println(ByeByeFirst([]string{}))
+	fmt.Println(ByeByeFirst([]string{"first", "second"}))
+	fmt.Println(ByeByeFirst([]string{"", "abcd", "efg"}))
+}
+```
+
+And its output :
+
+```console
+$ go run . | cat -e
+[]$
+[second]$
+[abcd efg]$
+```