add basic .editorconfig

Author: mathiasertl

.editorconfig

@@ -0,0 +1,17 @@
+[*]
+end_of_line = lf
+trim_trailing_whitespace = true
+charset = utf-8
+
+[*.{py,pyi}]
+indent_style = space
+indent_size = 4
+
+[*.rst]
+insert_final_newline = true
+max_line_length = 110
+ij_wrap_on_typing = true
+
+[*.{yaml,yml}]
+indent_style = space
+indent_size = 2