Added .editorconfig to enforce some of the code style

.editorconfig

@@ -0,0 +1,15 @@
+# See http://editorconfig.org for a plugin to your editor!
+
+# Top-most EditorConfig file
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = tab
+indent_size = 4
+
+[*.md]
+trim_trailing_whitespace = false