Add support for editors supporting http://editorconfig.org.

.editorconfig

@@ -0,0 +1,19 @@
+# editorconfig.org
+
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = space
+indent_size = 2
+
+[*.md]
+trim_trailing_whitespace = false
+indent_style = tab
+indent_size = 4
+
+[*.txt]
+trim_trailing_whitespace = false