Added basic and some advanced menu options

cmd/client/advancedMenu.go

@@ -0,0 +1,40 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"log"
+	"os"
+	"strings"
+	"sync"
+)
+
+func advancedMenu(wg *sync.WaitGroup) {
+
+	var option string
+
+	for option != "0" {
+
+		fmt.Print("\nAdvanced Menu\n-------------\n\n")
+
+		fmt.Println("1. Change units (Fahrenheit/Celsius)")
+		fmt.Println("2. Enter precise location")
+		fmt.Print("0. Back\n\n")
+
+		reader := bufio.NewReader(os.Stdin)
+		input, err := reader.ReadString('\n')
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		option = strings.TrimSuffix(input, "\n")
+
+		if option == "1" {
+			fmt.Print("\nChanged units...\n\n")
+		} else if option == "2" {
+			fmt.Print("Precise location selected...\n\n")
+		}
+	}
+
+	wg.Done()
+}

cmd/client/main.go

@@ -0,0 +1,51 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"log"
+	"os"
+	"strings"
+	"sync"
+)
+
+func main() {
+
+	var option string
+	var wg sync.WaitGroup
+
+	fmt.Println("\n==============================================")
+	fmt.Println("| Welcome to the OpenWeatherMap-gRPC Client! |")
+	fmt.Print("==============================================\n")
+
+	for option != "0" {
+
+		fmt.Print("\nMain Menu\n---------\n\n")
+
+		fmt.Println("1. Today's forecast (use current location)")
+		fmt.Println("2. Advanced options")
+		fmt.Print("0. Exit\n\n")
+
+		reader := bufio.NewReader(os.Stdin)
+		input, err := reader.ReadString('\n')
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		option = strings.TrimSuffix(input, "\n")
+
+		if option == "1" {
+			fmt.Println("Option 1 selected...")
+		} else if option == "2" {
+			wg.Add(1)
+			go advancedMenu(&wg)
+			wg.Wait()
+		} else if option == "0" {
+			return
+		} else {
+			fmt.Print("\nOops! An error occurred, please choose a valid option.\n\n")
+		}
+
+	}
+
+}

cmd/service/main.go

@@ -1,11 +0,0 @@
-package main
-
-import "flag"
-
-func main() {
-
-	var mode string
-	flag.StringVar(&mode, "mode", "client", "Specify \"client\" or \"server\" mode")
-	flag.Parse()
-
-}