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+Message template sdk
+====
+
+# Overview
+A small library for creating templates from blocks using code. The same blocks can be used for different templates. The basic principle of working with the library is to provide a flexible and simple system for writing dynamically generated text.
+
+# Writing a template with variables
+The writer's regex is passed a `template` with selectors, a `regex` string to find these selectors, and a `lambda function` to create selectors.
+```c#
+var writer = new RegexTextWriter(
+    "I hold %[ITEM]% in my %[HAND]%",
+    "%\\[([^%,\\s]+)\\]%",
+    s => $"%[{s}]%"
+);
+var text = writer.ToWriting(new Dictionary<string, string>
+{
+    {"ITEM", "tea"},
+    {"HAND", "left hand"}
+});
+Assert.AreEqual("I hold tea in my left hand", text);
+```
+If you do not pass a value to any variable, it is replaced with a `default value`, which can also be passed (by default, this is an empty string).
+
+# Generating template from blocks
+Using `TemplateBlockFactory` for creating blocks with `default regex`.
+
+## Order example
+```c#
+var deliveryConfiguration = TextBlockFactory.CreateTemplate(
+    "Delivery method: %[METHOD]%\n" +
+    "Delivery address: %[ADDRESS]%\n" +
+    "Delivery date: %[DATE]%",
+    new Dictionary<string, ITextBlock>
+    {
+        {"METHOD", TextBlockFactory.CreateText("courier")},
+        {"ADDRESS", TextBlockFactory.CreateText("Khreschatyk St, 32, Kyiv, 02000")},
+        {"DATE", TextBlockFactory.CreateText("08.04.2021")}
+    }
+);
+var paymentConfiguration = TextBlockFactory.CreateTemplate(
+    "Payment method: %[METHOD]%",
+    new Dictionary<string, ITextBlock>
+    {
+        {"METHOD", TextBlockFactory.CreateText("cash")}
+    }
+);
+var orderConfiguration = TextBlockFactory.CreateTemplate(
+    "Customer name: %[CUSTOMER_NAME]%\n" +
+    "Phone: %[PHONE]%\n" +
+    "Email address: %[EMAIL]%\n" +
+    "%[DELIVERY_CONFIGURATION]%\n" +
+    "%[PAYMENT_CONFIGURATION]%\n" +
+    "Comment to order: %[COMMENT]%\n" +
+    "Order date: %[ORDER_DATE]%",
+    new Dictionary<string, ITextBlock>
+    {
+        {"CUSTOMER_NAME", TextBlockFactory.CreateText("Vladislav Shirokiy")},
+        {"PHONE", TextBlockFactory.CreateText("+8888888888")},
+        {"EMAIL", TextBlockFactory.CreateText("vlad16062001@gmail.com")},
+        {"DELIVERY_CONFIGURATION", deliveryConfiguration},
+        {"PAYMENT_CONFIGURATION", paymentConfiguration},
+        {"COMMENT", TextBlockFactory.CreateText("Deliver quickly!")},
+        {"ORDER_DATE", TextBlockFactory.CreateText("04.08.2021")}
+    }
+);
+var orderFactory = new Func<int, (string, int, int), ITextBlock>((number, tuple) =>
+    TextBlockFactory.CreateTemplate("%[NUMBER]%. %[ITEM]% %[COUNT]%x%[PRICE]% $",
+        new Dictionary<string, ITextBlock>
+        {
+            {"NUMBER", TextBlockFactory.CreateText(number.ToString())},
+            {"ITEM", TextBlockFactory.CreateText(tuple.Item1)},
+            {"COUNT", TextBlockFactory.CreateText(tuple.Item2.ToString())},
+            {"PRICE", TextBlockFactory.CreateText(tuple.Item3.ToString())},
+        }
+    )
+);
+var orders = new List<(string, int, int)>
+{
+    ("Chair", 1, 25),
+    ("Table", 1, 50),
+    ("Wardrobe", 1, 45)
+};
+const int discount = 15;
+const int shippingCost = 25;
+var block = TextBlockFactory.CreateTemplate(
+    "Order №%[ORDER_NUMBER]%\n" +
+    "%[ORDER_CONFIGURATION]%\n" +
+    "-------\n" +
+    "%[ORDERS]%\n" +
+    "\n" +
+    "%[CHECK]%",
+    new Dictionary<string, ITextBlock>
+    {
+        {"ORDER_NUMBER", TextBlockFactory.CreateText("13")},
+        {"ORDER_CONFIGURATION", orderConfiguration},
+        {
+            "ORDERS", TextBlockFactory.MergeTemplates("\n", orders
+                .Select((order, number) => orderFactory(number + 1, order))
+                .ToArray()
+            )
+        },
+        {
+            "CHECK", TextBlockFactory.CreateTemplate(
+                "Discount: %[DISCOUNT]% $\n" +
+                "Shipping cost: %[SHIPPING_COST]% $\n" +
+                "Total amount: %[TOTAL_AMOUNT]% $",
+                new Dictionary<string, ITextBlock>
+                {
+                    {"DISCOUNT", TextBlockFactory.CreateText(discount.ToString())},
+                    {"SHIPPING_COST", TextBlockFactory.CreateText(shippingCost.ToString())},
+                    {
+                        "TOTAL_AMOUNT", TextBlockFactory.CreateText(
+                            (orders.Aggregate(0,
+                                    (total, order) => total + order.Item2 * order.Item3) +
+                                shippingCost -
+                                discount)
+                            .ToString()
+                        )
+                    }
+                }
+            )
+        }
+    }
+);
+const string result = "Order №13\n" +
+    "Customer name: Vladislav Shirokiy\n" +
+    "Phone: +8888888888\n" +
+    "Email address: vlad16062001@gmail.com\n" +
+    "Delivery method: courier\n" +
+    "Delivery address: Khreschatyk St, 32, Kyiv, 02000\n" +
+    "Delivery date: 08.04.2021\n" +
+    "Payment method: cash\n" +
+    "Comment to order: Deliver quickly!\n" +
+    "Order date: 04.08.2021\n" +
+    "-------\n" +
+    "1. Chair 1x25 $\n" +
+    "2. Table 1x50 $\n" +
+    "3. Wardrobe 1x45 $\n" +
+    "\n" +
+    "Discount: 15 $\n" +
+    "Shipping cost: 25 $\n" +
+    "Total amount: 130 $";
+Assert.AreEqual(block.Write(), result);
+```