Add .editorconfig file

.editorconfig

@@ -0,0 +1,19 @@
+# EditorConfig is awesome: http://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+# Unix-style newlines with a newline ending every file
+[*]
+end_of_line = lf
+charset = utf-8
+
+[*.{md,py}]
+max_line_length = 79
+
+# 4 space indentation
+[*.py]
+indent_style = space
+indent_size = 4
+trim_trailing_whitespace = true
+insert_final_newline = true