Added password complexity indicator on new database

Database password control now inside a Border element
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ModernKeePass/ViewModels/NewVm.cs

@@ -0,0 +1,21 @@
+using ModernKeePassLib.Cryptography;
+
+namespace ModernKeePass.ViewModels
+{
+    public class NewVm : OpenVm
+    {
+        private string _password = string.Empty;
+
+        public string Password
+        {
+            get { return _password; }
+            set
+            {
+                _password = value;
+                NotifyPropertyChanged("PasswordComplexityIndicator");
+            }
+        }
+
+        public double PasswordComplexityIndicator => QualityEstimation.EstimatePasswordBits(Password.ToCharArray());
+    }
+}