DEV: Add editorconfig (data-apis#138)

* Add editorconfig

* match prettier default

---------

Co-authored-by: Lucas Colley <lucas.colley8@gmail.com>

Author: NeilGirdhar

.editorconfig

@@ -0,0 +1,14 @@
+root = true
+
+[*.{py,md}]
+indent_style = space
+end_of_line = lf
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.py]
+max_line_length = 88
+indent_size = 4
+
+[*.md]
+max_line_length = 80