Add .editorconfig (#482)

https://editorconfig.org/

Author: aobolensk

.editorconfig

@@ -0,0 +1,27 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = space
+indent_size = 4
+
+[*.{cpp,h,hpp,c}]
+indent_size = 2
+
+[*.{yml,yaml}]
+indent_size = 2
+
+[*.py]
+indent_size = 4
+
+[Makefile]
+indent_style = tab
+
+[{CMakeLists.txt,*.cmake}]
+indent_size = 2
+
+[*.{md,rst}]
+trim_trailing_whitespace = false