chore: .editorconfig 파일 추가 #1

.editorconfig

@@ -0,0 +1,16 @@
+root = true
+
+[*]
+charset = utf-8
+indent_size = 4
+indent_style = space
+max_line_length = 150
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.{kt,kts}]
+ktlint_code_style = ktlint_official
+ktlint_standard_import-ordering = disabled
+ktlint_standard_package-naming = disabled
+ij_kotlin_allow_trailing_comma = true
+ij_kotlin_allow_trailing_comma_on_call_site = true