Add .editorconfig for a consistent environment

Author: tomschr

.editorconfig

@@ -0,0 +1,16 @@
+# http://editorconfig.org
+root = true
+
+[*]
+end_of_line = lf
+charset = utf-8
+max_line_length = 99
+
+[*.py]
+indent_style = space
+indent_size = 4
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[docs/Makefile]
+indent_style = tab