Added password complexity indicator on new database

Database password control now inside a Border element
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ModernKeePass/Converters/ProgressBarLegalValuesConverter.cs

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+using System;
+using Windows.UI.Xaml.Data;
+
+namespace ModernKeePass.Converters
+{
+    public class ProgressBarLegalValuesConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, string language)
+        {
+            var legalValuesOptionString = parameter as string;
+            var legalValuesOptions = legalValuesOptionString?.Split(new[] { "," }, StringSplitOptions.RemoveEmptyEntries);
+            if (legalValuesOptions == null || legalValuesOptions.Length != 2) return 0;
+
+            var minValue = double.Parse(legalValuesOptions[0]);
+            var maxValue = double.Parse(legalValuesOptions[1]);
+            var count = value is double ? (double)value : 0;
+            if (count > maxValue) return maxValue;
+            if (count < minValue) return minValue;
+            return count;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, string language)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}