The Developer’s Guide to Azure Ebook Added. (#2940)

The Developer’s Guide to Azure Ebook Added.

free-programming-books.md

@@ -329,6 +329,7 @@
 * [Monitoring Modern Infrastructure](https://www.datadoghq.com/ebook/monitoring-modern-infrastructure/) *(account required)*
 * [Multi-tenant Applications for the Cloud, 3rd Edition](http://www.microsoft.com/en-us/download/details.aspx?id=29263)
 * [OpenStack Operations Guide](https://docs.openstack.org/ops-guide/index.html)
+* [The Developer’s Guide to Azure](https://azure.microsoft.com/en-us/campaigns/developer-guide/)
 
 
 #### Competitive Programming