Add .editorconfig

.editorconfig

@@ -0,0 +1,20 @@
+# EditorConfig is awesome: http://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+# Baseline
+[*]
+charset = utf-8-bom
+indent_style = space
+indent_size = 4
+tab_width = 4
+trim_trailing_whitespace = true
+max_line_length = 200
+insert_final_newline = true
+
+[*.{json,xml,csproj,config}]
+indent_size = 2
+
+[Directory.*.props]
+indent_size = 2