Add Lesson 2 Task 3

Lesson_2/Task_3/Program.cs

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+/*
+* Lesson 2 Task 3: get a collection of customer, then ask for a name and output the matching users, and also count how many of the selected users are older than 18
+* Author: Stanislav Mykhailenko
+* License: Unlicense
+*/
+
+List<Customer> customers = new List<Customer>()
+{
+    new Customer("Tom", 14, "Street 1"),
+    new Customer("Bob", 26, "Street 2"),
+    new Customer("Sam", 10, "Street 3"),
+    new Customer("Vadim", 57, "Street 4"),
+    new Customer("Alex", 80, "Street 5"),
+    new Customer("Alex", 15, "Street 6"),
+    new Customer("Tom", 65, "Street 7"),
+    new Customer("Andrew", 33, "Street 8"),
+    new Customer("Bob", 22, "Street 9"),
+    new Customer("Alex", 77, "Street 10")
+};
+
+string? name;
+
+do
+{
+	Console.Write("Enter name: ");
+	name = Console.ReadLine();
+} while (name == null);
+
+var selected = from s in customers where s.Name == name select s;
+
+foreach (Customer customer in selected)
+{
+	Console.WriteLine(customer);
+}
+
+var number = selected.Where(s => s.Age >= 18).Count();
+
+Console.WriteLine("Amount of customers older than 18: " + number);
+
+class Customer
+{
+	public string Name { get;}
+	public int Age { get;}
+	public string Address { get;}
+
+	public override string ToString()
+	{
+		return "Name: " + Name + ", Age: " + Age + ", Address: " + Address;
+	}
+
+	public Customer(string name, int age, string address)
+	{
+		Name = name;
+		Age = age;
+		Address = address;
+	}
+}

Lesson_2/Task_3/Task_3.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net7.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>