[ALLI-11319] Deprecate library.

README.md

@@ -2,6 +2,13 @@
 
 [![Build Status](https://travis-ci.org/AgencyPMG/CsvSugar.svg)](https://travis-ci.org/AgencyPMG/CsvSugar)
 
+:warning: **DEPRECATION NOTICE**: This project is no longer maintained and might not work as expected.
+Use [Alli Platform SDK for PHP](https://github.com/AgencyPMG/alli-platform-sdk-php/tree/master/src/Fixtures) instead.
+Check this migration guide for more information:
+[Migrating from PMG CsvSugar to Alli Platform SDK for PHP](https://agencypmg.atlassian.net/wiki/spaces/ALLISDK/pages/2996862986/Alli+Platform+SDK+0.36+Upgrade+Guide)
+
+***
+
 A few helpers to make reading and writing CSV (and other delimited files)
 a bit easier.
 

src/Reader.php

@@ -19,6 +19,8 @@
  * }
  *
  * @since 1.0
+ *
+ * @deprecated This class is deprecated. Use [Alli\Platform\Util\Csv\Reader](https://github.com/AgencyPMG/alli-platform-sdk-php/blob/master/src/Util/Csv/Reader.php) instead.
  */
 interface Reader extends \Traversable
 {

src/Writer.php

@@ -15,6 +15,8 @@
  * Common interface for CSV writers.
  *
  * @since 1.0
+ *
+ * @deprecated This class is deprecated. Use [Alli\Platform\Util\Csv\Writer](https://github.com/AgencyPMG/alli-platform-sdk-php/blob/master/src/Util/Csv/Writer.php) instead.
  */
 interface Writer
 {