Add .editorconfig file

.editorconfig

@@ -0,0 +1,18 @@
+# For more information about the properties used in
+# this file, please see the EditorConfig documentation:
+# http://editorconfig.org/
+
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 2
+indent_style = space
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.md]
+# Markdown uses the trailing whitespaces
+# https://daringfireball.net/projects/markdown/syntax#block
+trim_trailing_whitespace = false