chore: add a .editorconfig file

Author: andreynering

.editorconfig

@@ -0,0 +1,18 @@
+# https://editorconfig.org/
+
+root = true
+
+[*]
+charset = utf-8
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = space
+indent_size = 2
+
+[*.go]
+indent_style = tab
+indent_size = 8
+
+[*.golden]
+insert_final_newline = false
+trim_trailing_whitespace = false