Add EditorConfig

Author: jdno

.editorconfig

@@ -0,0 +1,20 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.md]
+max_line_length = 80
+trim_trailing_whitespace = false
+
+[*.rs]
+indent_size = 4
+indent_style = space
+max_line_length = 100
+
+[*.toml]
+indent_size = 2
+indent_style = space