add(subjects): issamestring subject

subjects/issamestring/README.md

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+## issamestring
+
+### Instructions
+
+Write a function that returns `true` if the two `strings` passed as parameter are equal. Otherwise it returns `false`.
+
+The function will ignore the case of the characters.
+
+### Expected function
+
+```go
+func IsSameString(s1, s2 string) bool {
+
+}
+```
+
+### Usage
+
+Here is a possible program to test your function :
+
+```go
+package main
+
+import (
+	"fmt"
+	"piscine"
+)
+
+func main() {
+  fmt.Println(piscine.IsSameString("hello world!", "HELLO WORLD!"))
+	fmt.Println(piscine.IsSameString("0101 is awesome", "0101 is AWESOME"))
+	fmt.Println(piscine.IsSameString("foo baz", "foo bar"))
+}
+```
+
+And its output :
+
+```console
+$  go run .
+true
+true
+false
+```