Added Unit Converter mode without functionality

src/main/c/main_taschenrechner.c

@@ -22,7 +22,7 @@ int divide(int a, int b) {
     return a / b;
 }
 
-// 
+
 // scientificmode
 
 int scientificMode(){
@@ -100,6 +100,23 @@ void programmingMode() {
 
 }
 
+// Unit converter mode
+
+void unitConverterMode() {
+    int choice;
+    double value, result;
+
+    printf("Unit Converter Mode:\n");
+    printf("1. Meter to Kilometer\n");
+    printf("2. Kilogram to Gram\n");
+    printf("3. Celsius to Fahrenheit\n");
+    printf("Enter your choice: ");
+    scanf("%d", &choice);
+
+    printf("Enter the value to convert: ");
+    scanf("%lf", &value);
+
+}
 
 // change mode
 int mode(int userChoice){