Add project data

Tabletop.Core/Extensions/StringExtensions.cs

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+namespace Tabletop.Core.Extensions
+{
+    public static class StringExtensions
+    {
+        /// <summary>
+        /// Generates a random string
+        /// </summary>
+        /// <param name="length">The length of the random string</param>
+        /// <returns></returns>
+        public static string RandomString(int length)
+        {
+            var chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
+            var stringChars = new char[length];
+            var random = new Random();
+
+            for (int i = 0; i < stringChars.Length; i++)
+            {
+                stringChars[i] = chars[random.Next(chars.Length)];
+            }
+
+            var finalString = new string(stringChars);
+            return finalString;
+        }
+    }
+}