Add Software Engineering at Google (#6293)

* Update free-programming-books-subjects.md

Add SWE at Google

* Update free-programming-books-subjects.md

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books/free-programming-books-subjects.md

@@ -629,6 +629,7 @@ Kerridge (PDF) (email address *requested*, not required)
 * [Don't Just Roll the Dice](https://www.red-gate.com/library/dont-just-roll-the-dice) - Neil Davidson (PDF)
 * [How to Do What You Love & Earn What You’re Worth as a Programmer](https://leanpub.com/dowhatyoulove/read) - Reginald Braithwaite
 * [Professional Software Development For Students](https://mixmastamyk.bitbucket.io/pro_soft_dev/intro.html) - Mike G. Miller
+* [Software Engineering at Google](https://abseil.io/resources/swe-book) - Titus Winters, Tom Manshreck & Hyrum Wright
 * [Software Environment Concepts](https://softwareconcepts.vercel.app) - Amr Elmohamady (:construction: *in process*)
 * [What I've Learned From Failure](https://leanpub.com/shippingsoftware/read) - Reginald Braithwaite