Add .editorconfig file for consistent code formatting (#537)

Author: tasansal

.editorconfig

@@ -0,0 +1,15 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.{py,toml}]
+indent_style = space
+indent_size = 4
+
+[*.{yml,yaml,json}]
+indent_style = space
+indent_size = 2