refactory menu about: change name to 'help' and add 'documentation/re…

…lease notes/donate menu' items

src/WiremockUI/Forms/FormDonate.cs

@@ -0,0 +1,25 @@
+using System;
+using System.Windows.Forms;
+using WiremockUI.Languages;
+
+namespace WiremockUI
+{
+    public partial class FormDonate : Form
+    {
+        public FormDonate()
+        {
+            InitializeComponent();
+            btnClose.Text = Resource.btnClose;
+        }
+
+        private void btnClose_Click(object sender, EventArgs e)
+        {
+            this.Close();
+        }
+
+        private void pictureBox1_Click(object sender, EventArgs e)
+        {
+            Helper.Process("https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=BJKBZXZJFVNUL&lc=US&item_name=wiremockui&item_number=wiremockui&currency_code=BRL&bn=PP%2dDonationsBF%3abtn_donate_LG%2egif%3aNonHosted");
+        }
+    }
+}