add(subject):add README.md

subjects/fromto/README.md

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+## fromto
+
+### Instructions
+
+- Write a function that takes two `integers` and returns a string representing the range of numbers from the first to the second.
+
+- The function can return the numbers in any order.
+
+- The number must be separated by a comma and a space.
+ 
+- If any of the arguments is bigger than 99 or less than 0, the function returns `"invalid"` followed by a newline (`'\n'`).
+
+- Add `0` at the first of any number if it is less than 10.  
+
+- Add a new line (`'\n'`) at the end of the string.
+
+
+### Expected function
+```go
+func FromTo(from int, to int) string {
+
+}
+```
+
+
+### Usage
+
+Here is a possible program to test your function :
+
+```go
+package main
+
+import (
+	"fmt"
+)
+
+func main() {
+	fmt.Println(FromTo(1, 10))
+    fmt.Println(FromTo(10, 1))
+    fmt.Println(FromTo(10, 10))
+    fmt.Println(FromTo(100, 10))
+}
+```
+And its output :
+
+```console
+$ go run . | cat -e
+01, 02, 03, 04, 05, 06, 07, 08, 09, 10$
+10, 09, 08, 07, 06, 05, 04, 03, 02, 01$
+10$
+invalid$
+```