Add Lesson 1 Task 2

Lesson_1/Program.cs

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+int number;
+
+Console.Write("Enter a number: ");
+
+if (int.TryParse(Console.ReadLine(), out number))
+{
+    Console.WriteLine(number + 10);
+}
+else
+{
+    Console.WriteLine("Invalid data entereed.");
+}

README.md

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+# New Generation 2023 Stanislav Mykhailenko
+
+Stanislav Mykhailenko's code for New Generation (2023 C# course).
+
+All code in this repository is Unlicensed, see UNLICENSE.
+
+## Task list
+
+Checked means the task is Done.
+
+### Lesson 1
+
+- [ ] Task 2
+- [ ] Task 3
+- [ ] Task 4

UNLICENSE

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+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <http://unlicense.org/>