feat: add .editorconfig file

.editorconfig

@@ -0,0 +1,19 @@
+# Reference: https://editorconfig.org/#file-format-details
+
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.{js,ts}]
+block_comment_start = /**
+block_comment = *
+block_comment_end = */
+
+[*.md]
+trim_trailing_whitespace = false