Adding some additional resources (#159)

Author: simonsan

additional_resources.md

@@ -4,4 +4,10 @@ A collection of complementary helpful content
 
 ## Talks
 
-- [Design Patterns in Rust](https://www.youtube.com/watch?v=Pm_oO0N5B9k) by Nick Cameron at the PDRust (2016)
+- [Design Patterns in Rust](https://www.youtube.com/watch?v=Pm_oO0N5B9k) by Nicholas Cameron at the PDRust (2016)
+- [Writing Idiomatic Libraries in Rust](https://www.youtube.com/watch?v=0zOg8_B71gE) by Pascal Hertleif at RustFest (2017)
+- [Rust Programming Techniques](https://www.youtube.com/watch?v=vqavdUGKeb4) by Nicholas Cameron at LinuxConfAu (2018)
+
+## Books (Online)
+
+- [The Rust API Guidelines](https://rust-lang.github.io/api-guidelines)