Add .editorconfig

.editorconfig

@@ -0,0 +1,18 @@
+root = true
+
+[*.{c,h,d,di,dd,json}]
+end_of_line = lf
+insert_final_newline = true
+indent_style = tab
+indent_size = 4
+trim_trailing_whitespace = true
+charset = utf-8
+
+[.travis.yml]
+end_of_line = lf
+insert_final_newline = true
+indent_style = space
+indent_size = 2
+trim_trailing_whitespace = true
+charset = utf-8
+