Added .editorconfig file

This is so the Markdown files can be safely edited on software that would otherwise trim trailing spaces by default.

Author: GaryJones

.editorconfig

@@ -0,0 +1,24 @@
+# This file is for unifying the coding style for different editors and IDEs
+# editorconfig.org
+
+# WordPress Coding Standards
+# http://make.wordpress.org/core/handbook/coding-standards/
+
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = tab
+
+[*.json]
+indent_style = space
+indent_size = 2
+
+[*.txt]
+end_of_line = crlf
+
+[*.md]
+trim_trailing_whitespace = false