Implement ability to add folders/directories (offline)

src/offline/add.go

@@ -0,0 +1,22 @@
+package offline
+
+import (
+	"fmt"
+	"os"
+)
+
+func AddFolder(targetLocation string) {
+	// create the directory specified by targetLocation
+	err := os.Mkdir(targetLocation, 0700)
+	if err != nil {
+		// if the directory already exists, print an error message and exit
+		if os.IsExist(err) {
+			fmt.Println(AnsiError + "Directory already exists" + AnsiReset)
+			os.Exit(1)
+		} else {
+			fmt.Println(AnsiError + "Failed to create directory: " + err.Error() + AnsiReset)
+			os.Exit(1)
+		}
+	}
+	// TODO If in online mode, create the directory on the server
+}