docs: Adding a book "Angular from Scratch" (#46352)

Adding a book "Angular from Scratch" in the resources file
PR Close #46352

aio/content/marketing/resources.json

@@ -657,6 +657,11 @@
             "title": "Rangle’s Angular Training Book",
             "desc": "It's a free book, drawn from years of collective experience and aligned with the best practices of modern software development. The book covers the most important Angular topics, from getting started with the Angular toolchain to writing Angular applications in a scalable and maintainable manner.",
             "url": "https://angular-training-guide.rangle.io/"
+          },
+          "angular-from-scratch": {
+            "title": "Angular from Scratch",
+            "desc": "Learn Angular from Scratch, building a sales application",
+            "url": "https://leanpub.com/book-angular"
           }
         }
       },