Moved source files and updated readme file.

src/FilenamePromptForm.cs

@@ -0,0 +1,54 @@
+/*
+Copyright 2009-2022 Intel Corporation
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+using System;
+using System.Windows.Forms;
+
+namespace MeshCentralRouter
+{
+    public partial class FilenamePromptForm : Form
+    {
+        public string filename
+        {
+            get { return mainTextBox.Text; }
+            set { mainTextBox.Text = value; }
+        }
+
+        public FilenamePromptForm(string operation, string filename)
+        {
+            InitializeComponent();
+            Translate.TranslateControl(this);
+            mainGroupBox.Text = operation;
+            mainTextBox.Text = filename;
+            okButton.Enabled = (filename.Length > 0);
+        }
+
+        private void mainTextBox_TextChanged(object sender, EventArgs e)
+        {
+            okButton.Enabled = (mainTextBox.Text.Length > 0);
+        }
+
+        private void okButton_Click(object sender, EventArgs e)
+        {
+            DialogResult = DialogResult.OK;
+        }
+
+        private void cancelButton_Click(object sender, EventArgs e)
+        {
+            DialogResult = DialogResult.Cancel;
+        }
+    }
+}