add .editorconfig file (#585)

* add .editorconfig file

* drop charset from editorconfig

* Update .editorconfig

Co-Authored-By: Michael Niksa <miniksa@microsoft.com>

.editorconfig

@@ -0,0 +1,13 @@
+root = true
+
+[*]
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[{*.cpp,*.c,*.hpp,*.h,*.cs}]
+indent_style = space
+indent_size = 4
+
+[*.json]
+indent_style = space
+indent_size = 2