Issue #1713662 by treyhunner, Eric_A, nod_, sun: Introduce .editorconfig to...

Issue #1713662 by treyhunner, Eric_A, nod_, sun: Introduce .editorconfig to auto-configure editors that support it.

.editorconfig

+# Drupal editor configuration normalization
+# @see http://editorconfig.org/
+
+# This is the top-most .editorconfig file; do not search in parent directories.
+root = true
+
+# All files.
+[*]
+end_of_line = LF
+indent_style = space
+indent_size = 2
+
+# Not in the spec yet:
+# @see https://github.com/editorconfig/editorconfig/wiki/EditorConfig-Properties
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true