Add .editorconfig

Author: petk

.editorconfig

@@ -0,0 +1,24 @@
+# http://editorconfig.org
+
+root = true
+
+[*]
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.php]
+indent_style = space
+indent_size = 4
+
+[*.md]
+trim_trailing_whitespace = false
+
+[{*.json, *.yml, *.xml, *.xml.dist}]
+indent_style = space
+indent_size = 4
+
+[{.travis.yml}]
+indent_style = space
+indent_size = 2