Starting a strings-runes example

For now just the code, no output, no comments

For #411

examples/strings-runes/strings-runes.go

@@ -0,0 +1,45 @@
+package main
+
+import (
+	"fmt"
+	"unicode/utf8"
+)
+
+// TODO: Thai hello, vowels
+
+func main() {
+	const hello = "สวัสดี"
+	foo(hello)
+}
+
+func foo(s string) {
+	fmt.Println("Len:", len(s))
+
+	for i := 0; i < len(s); i++ {
+		fmt.Printf("%x ", s[i])
+	}
+	fmt.Println()
+
+	fmt.Println("Rune count:", utf8.RuneCountInString(s))
+
+	for idx, runeValue := range s {
+		fmt.Printf("%#U starts at %d\n", runeValue, idx)
+	}
+
+	fmt.Println("\nUsing DecodeRuneInString")
+	for i, w := 0, 0; i < len(s); i += w {
+		runeValue, width := utf8.DecodeRuneInString(s[i:])
+		fmt.Printf("%#U starts at %d\n", runeValue, i)
+		w = width
+
+		examineRune(runeValue)
+	}
+}
+
+func examineRune(r rune) {
+	if r == 't' {
+		fmt.Println("found tee")
+	} else if r == 'ส' {
+		fmt.Println("found so sua")
+	}
+}