style: Add .editorconfig file

Author: BurningEnlightenment

.editorconfig

@@ -0,0 +1,17 @@
+# Editor configuration, see 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 = 79
+
+[*.{md,rst}]
+trim_trailing_whitespace = false
+
+[*.y{,a}ml]
+indent_size = 2