Synchronization of old projects

Part1

C#核心/Lesson1_类和对象练习/Program.cs

@@ -0,0 +1,10 @@
+namespace Lesson1_类和对象练习
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            Console.WriteLine("Hello, World!");
+        }
+    }
+}