add .editorconfig

.editorconfig

@@ -0,0 +1,30 @@
+# http://editorconfig.org
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 2
+indent_style = space
+insert_final_newline = true
+max_line_length = 80
+trim_trailing_whitespace = true
+
+[*.md]
+max_line_length = 0
+trim_trailing_whitespace = false
+
+# https://github.com/editorconfig/editorconfig-core-py/blob/master/.editorconfig
+[*.{py,rst,txt}]
+indent_style = space
+trim_trailing_whitespace = true
+indent_size = 4
+end_of_line = LF
+
+[*.yml]
+indent_style = space
+indent_size = 2
+end_of_line = LF
+
+[COMMIT_EDITMSG]
+max_line_length = 0