Initial project setup for FileCopyHelper

Add core project files for FileCopyHelper, including solution, main forms, dialogs, models, services, resources, and configuration. Implements file conflict and configuration save dialogs, sets up Windows Forms application targeting .NET Framework 4.7.2, and includes required dependencies and build scripts.

Author: TangColin

.editorconfig

@@ -0,0 +1,28 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = crlf
+insert_final_newline = true
+indent_style = space
+indent_size = 4
+trim_trailing_whitespace = true
+
+[*.{cs,vb}]
+dotnet_sort_system_directives_first = true
+dotnet_separate_import_directive_groups = false
+
+[*.cs]
+csharp_new_line_before_open_brace = all
+csharp_new_line_before_else = true
+csharp_new_line_before_catch = true
+csharp_new_line_before_finally = true
+csharp_new_line_before_members_in_object_initializers = true
+csharp_new_line_before_members_in_anonymous_types = true
+csharp_new_line_between_query_expression_clauses = true
+
+[*.{json,xml}]
+indent_size = 2
+
+[*.{props,targets}]
+indent_size = 2