Add an .editorconfig file to make it easier to edit uniformly.

Author: jyasskin

Diff for: .editorconfig

@@ -0,0 +1,13 @@
+# top-most EditorConfig file
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_style = space
+indent_size = 2
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.json]
+indent_size = 4