Merge pull request microsoft#2178 from tinganho/editorconfig

Adds editorconfig file

Author: mhegazy

.editorconfig

@@ -0,0 +1,10 @@
+
+root = true
+
+[{src,scripts}/**.{ts,json,js}]
+end_of_line = crlf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+indent_style = space
+indent_size = 4