Copy missing additional-pages.dox from 1.3.4 tag.

libnfc/additional-pages.dox

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+/** 
+ * @mainpage libnfc reference manual
+ *
+ * @section intro_sec Introduction
+ * This is the developer manual for \b libnfc.
+ * 
+ * @section quick_start_sec Quick start
+ * If you are looking for libnfc's public API, you should start with nfc.h
+ * Some commented examples that present how to use \b libnfc can be found here:
+ * @subpage examples_page
+ * 
+ * @section upgrading_sec Upgrading from previous version
+ * If you are upgrading from a previous \b libnfc version, please take care about changes, specially API changes.
+ * All important changes should be listed in @subpage changelog_page.
+ */
+
+/**
+ * @page examples_page Examples
+ * @section intro_sec Introduction
+ * This page present some examples to help developers which use \b libnfc.
+ *
+ * @section example_1_sec Simple tag UID reader.
+ * This short commented code example should be helpful to quick start development with \b libnfc, it grab the first available NFC device and print the first found ISO14443-A tag (e.g. MIFARE Classic, MIFARE Ultralight).
+ * @include quick_start_example1.c
+ */
+
+/**
+ * @page changelog_page ChangeLog from 1.2.1 to 1.3.0
+ * @verbinclude ChangeLog
+ */
+