chore: provide an editor config

Author: Midnighter

.editorconfig

@@ -0,0 +1,20 @@
+# Editor Configuration (http://editorconfig.org)
+root = true
+
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 4
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+max_line_length = 88
+
+[*.{json,yml}]
+indent_size = 2
+
+[*.{md,rst}]
+trim_trailing_whitespace = false
+
+[Makefile]
+indent_style = tab