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DEV-3377 add(docs):add readme for swapFirst

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hamza 2 years ago committed by Michele
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      subjects/swapfirst/README.md

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subjects/swapfirst/README.md

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## swap-first
### Instructions
- Write a function that takes a slice in parameter and swaps the two first element then return the new value
- If the slice contains less than two elements return the same slice.
### Expected function
```go
func SwapFirst(slice []int) []int {
}
```
### Usage
Here is a possible program to test your function :
```go
package main
import (
"fmt"
)
func main() {
fmt.Println(SwapFirst([]int{1,2,3,4}))
fmt.Println(SwapFirst([]int{3,4}))
fmt.Println(SwapFirst([]int{1}))
}
```
And its output :
```console
$ go run .
[2,1,3,4]
[4,3]
[1]
```
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