Add simple password generator code

Created a new file "main.go" to add a simple password generator script using the apg library. This piece of code generates a random password with a fixed length of 15 characters including special characters, numeric, lower and uppercase letters.

example-code/simple-password-generator/main.go

@@ -0,0 +1,19 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/wneessen/apg-go"
+)
+
+func main() {
+	config := apg.NewConfig(apg.WithAlgorithm(apg.AlgoRandom),
+		apg.WithModeMask(apg.ModeSpecial|apg.ModeNumeric|apg.ModeLowerCase|apg.ModeUpperCase),
+		apg.WithFixedLength(15))
+	generator := apg.New(config)
+	password, err := generator.Generate()
+	if err != nil {
+		panic(err)
+	}
+	fmt.Println("Your password:", password)
+}