Added a new form to display the GPLv3 license for the project.

Resolves issue #6.

LicenseForm.Designer.cs

@@ -0,0 +1,86 @@
+namespace PDF_Merge
+{
+    partial class LicenseForm
+    {
+        /// <summary>
+        /// Required designer variable.
+        /// </summary>
+        private System.ComponentModel.IContainer components = null;
+
+        /// <summary>
+        /// Clean up any resources being used.
+        /// </summary>
+        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
+        protected override void Dispose(bool disposing)
+        {
+            if (disposing && (components != null))
+            {
+                components.Dispose();
+            }
+            base.Dispose(disposing);
+        }
+
+        #region Windows Form Designer generated code
+
+        /// <summary>
+        /// Required method for Designer support - do not modify
+        /// the contents of this method with the code editor.
+        /// </summary>
+        private void InitializeComponent()
+        {
+            System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(LicenseForm));
+            CloseBtn = new Button();
+            richTextBox1 = new RichTextBox();
+            GPLLink = new LinkLabel();
+            SuspendLayout();
+            // 
+            // CloseBtn
+            // 
+            CloseBtn.Location = new Point(342, 404);
+            CloseBtn.Name = "CloseBtn";
+            CloseBtn.Size = new Size(112, 34);
+            CloseBtn.TabIndex = 0;
+            CloseBtn.Text = "&Close";
+            CloseBtn.UseVisualStyleBackColor = true;
+            CloseBtn.Click += this.CloseBtn_Click;
+            // 
+            // richTextBox1
+            // 
+            richTextBox1.Location = new Point(12, 51);
+            richTextBox1.Name = "richTextBox1";
+            richTextBox1.Size = new Size(776, 347);
+            richTextBox1.TabIndex = 1;
+            richTextBox1.Text = resources.GetString("richTextBox1.Text");
+            // 
+            // GPLLink
+            // 
+            GPLLink.AutoSize = true;
+            GPLLink.Location = new Point(355, 9);
+            GPLLink.Name = "GPLLink";
+            GPLLink.Size = new Size(60, 25);
+            GPLLink.TabIndex = 2;
+            GPLLink.TabStop = true;
+            GPLLink.Text = "GPLv3";
+            GPLLink.LinkClicked += GPLLink_LinkClicked;
+            // 
+            // LicenseForm
+            // 
+            AutoScaleDimensions = new SizeF(10F, 25F);
+            AutoScaleMode = AutoScaleMode.Font;
+            ClientSize = new Size(800, 450);
+            Controls.Add(GPLLink);
+            Controls.Add(richTextBox1);
+            Controls.Add(CloseBtn);
+            Name = "LicenseForm";
+            Text = "GPLv3";
+            ResumeLayout(false);
+            PerformLayout();
+        }
+
+        #endregion
+
+        private Button CloseBtn;
+        private RichTextBox richTextBox1;
+        private LinkLabel GPLLink;
+    }
+}