add links to programs dir (#22)

README.md

@@ -7,6 +7,10 @@ Solana apps.
 
 Feel free to file an issue or submit a pull request.
 
+## Programs
+
+You can find the program examples used in the book in the [programs directory](./programs/).
+
 ## 💻 Run The Anchor Book Locally
 
 To run on a Mac, install [Homebrew](https://brew.sh/) if you don't already have

src/chapter_3/milestone_project_tic-tac-toe.md

@@ -1,4 +1,6 @@
 # Milestone Project - Tic-Tac-Toe
+> [Program Code](https://github.com/project-serum/anchor-book/tree/master/programs/tic-tac-toe)
+
 You're now ready to build your first anchor project. Create a new anchor workspace with
 
 ```