add: editorconfig to enforce consistent styles

.editorconfig

@@ -0,0 +1,50 @@
+# EditorConfig helps maintain consistent coding styles between editors
+root = true
+
+# Default settings for all files
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = space
+indent_size = 2
+
+# Svelte files
+[*.svelte]
+indent_style = space
+indent_size = 2
+trim_trailing_whitespace = false
+
+# JavaScript and TypeScript
+[*.{js,ts}]
+indent_style = space
+indent_size = 2
+
+# JSON files (package.json, config files, etc.)
+[*.json]
+indent_style = space
+indent_size = 2
+insert_final_newline = true
+trim_trailing_whitespace = false
+
+# YAML files (e.g., GitHub Actions, Lint configs)
+[*.yaml]
+indent_style = space
+indent_size = 2
+
+# Markdown files
+[*.md]
+trim_trailing_whitespace = false
+
+# Dockerfile
+[Dockerfile*]
+indent_style = space
+indent_size = 4
+insert_final_newline = false
+
+# Ignore binary files
+[*.{png,jpg,jpeg,gif,ico,svg,woff,woff2,eot,ttf,otf}]
+charset = unset
+trim_trailing_whitespace = false
+insert_final_newline = false