Add EditorConfig (#1849)

Problem: Every editor has different defaults.

Solution: Use EditorConfig to define coding styles

Author: lucacome

.editorconfig

@@ -0,0 +1,13 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_size = 4
+indent_style = tab
+
+[*.{md,yml,yaml}]
+indent_size = 2
+indent_style = space