Add 'Delphi Succinctly' (#7249)

books/free-programming-books-langs.md

@@ -640,6 +640,7 @@ That section got so big, we decided to split it into its own file, the [BY SUBJE
 
 ### Delphi / Pascal
 
+* [Delphi Succinctly](https://www.syncfusion.com/succinctly-free-ebooks/delphi) - Marco Breveglieri
 * [Essential Pascal Version 1 and 2](http://www.marcocantu.com/epascal/) - M. Cantù
 * [Expert Delphi](https://www.packtpub.com/free-ebooks/expert-delphi) - Paweł Głowacki (Packt account *required*)
 * [Modern Object Pascal Introduction for Programmers](https://github.com/michaliskambi/modern-pascal-introduction) - Michalis Kamburelis ([AsciiDoc](https://github.com/michaliskambi/modern-pascal-introduction/blob/master/modern_pascal_introduction.adoc#logical-relational-and-bit-wise-operators), [HTML](https://castle-engine.io/modern_pascal_introduction.html), [PDF](https://castle-engine.io/modern_pascal_introduction.pdf))