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
+```

subjects/zipstring/README.md

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+## zipstring
+
+### Instructions
+
+Write a function that takes a `string` and returns a new string that replaces every character with the number of duplicates and the character itself, deleting the extra duplications.
+
+The letters are from the Latin alphabet list only, any other characters, symbols or empty spaces shall not be tested.
+
+### Expected function
+
+```go
+func ZipString(s string) string {
+
+}
+```
+
+### Usage
+
+Here is a possible program to test your function :
+
+```go
+package main
+
+import (
+	"fmt"
+	"piscine"
+)
+
+func main() {
+	fmt.Println(piscine.ZipString("YouuungFellllas"))
+}
+
+```
+
+And its output :
+
+```console
+$ go run .
+1Y1o3u1n1g1F1e4l1a1s
+$
+```