Extra links in 'Resources' section

Author: krzychb

docs/resources.rst

@@ -6,10 +6,14 @@ Resources
 
 * Check the `Issues <https://github.com/espressif/esp-idf/issues>`_  section on GitHub if you find a bug or have a feature request. Please check existing `Issues <https://github.com/espressif/esp-idf/issues>`_ before opening a new one.
 
-* If you're interested in contributing to ESP-IDF, please check the :doc:`contribute/index`.
+* A comprehensive collection of `solutions <https://github.com/espressif/esp-iot-solution#solutions>`_, `practical applications <https://github.com/espressif/esp-iot-solution#esp32-iot-example-list>`_, `components and drivers <https://github.com/espressif/esp-iot-solution#components>`_ based on ESP-IDF is avialable in `ESP32 IoT Solution <https://github.com/espressif/esp-iot-solution>`_ repository. In most of cases descriptions are provided both in English and in 中文. 
 
 * To develop applications using Arduino platform, refer to `Arduino core for ESP32 WiFi chip <https://github.com/espressif/arduino-esp32#arduino-core-for-esp32-wifi-chip>`_.
 
-* For additional ESP32 product related information, please refer to `documentation <https://espressif.com/en/support/download/documents>`_ section of `Espressif <https://espressif.com/>`_ site.
+* Several `books <https://www.espressif.com/en/support/iot-college/books-new>`_ have been written about ESP32 and they are listed on `Espressif <https://www.espressif.com/en/support/iot-college/books-new>`__ web site.
+
+* If you're interested in contributing to ESP-IDF, please check the :doc:`contribute/index`.
+
+* For additional ESP32 product related information, please refer to `documentation <https://espressif.com/en/support/download/documents>`_ section of `Espressif <https://espressif.com/en/support/download/documents>`__ site.
 
-* Mirror of this documentation is available under: https://dl.espressif.com/doc/esp-idf/latest/.
+* Mirror of this documentation is available under: https://espressif-docs.readthedocs-hosted.com/projects/esp-idf/en/latest/ and https://dl.espressif.com/doc/esp-idf/latest/.