DEV-3203 add solution part

subjects/setspace/README.md

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+## set-space
+
+### Instructions 
+
+Write a function that takes a pascal case string and returns the same string with spaces between each word.
+
+- The function must return an empty string if the input string is empty.
+
+- The function must return `"Error"` if the input string is not a pascal case string.
+
+- The pascal case begins with a capital letter, and each word begins with a capital letter without a space between them for example: `"HelloWorld`"` is a valid pascal case string.
+
+- The pascal case cannot contain any non-alphabetic character, for example: `"Hello World12`"` is not a valid pascal case string.
+
+### Expected function
+
+```go
+func SetSpace(s string) string {
+
+}
+```
+
+### Usage
+
+Here is a possible program to test your function :
+
+```go
+package main
+
+import "fmt"
+
+func main(){
+    fmt.Println(SetSpace("HelloWorld"))
+    fmt.Println(SetSpace("Hello World12"))
+    fmt.Println(SetSpace("Hello World"))
+    fmt.Println(SetSpace("LoremIpSumWord"))
+    fmt.Println(SetSpace(""))
+}
+```
+
+And its output :
+
+```console
+$ go run . | cat -e
+Hello World$
+Error$
+Error$
+Lorem Ipsum Word$
+$
+```