Merge pull request #133 from rastringer/patch-1

Adds speaker notes to Compound Types section

src/basic-syntax/compound-types.md

@@ -24,3 +24,27 @@ fn main() {
     println!("2nd index: {}", t.1);
 }
 ```
+
+<details>
+    
+Key points:
+    
+Arrays:
+    
+*Arrays have elements of the same type, `T`, and length, `N`, which is a compile-time constant. 
+
+*We can use literals to assign values to arrays.
+
+*In the main function, the print statement asks for the debug implementation with the `?` format parameter: `{a}` gives the default output, `{a:?}` gives the debug output.
+
+*Adding `#`, eg `{a:#?}`, invokes a "pretty printing" format, which can be easier to read.
+
+Tuples:
+
+*Like arrays, tuples have a fixed length.
+
+*Tuples group together values of different types into a compound type. 
+
+*Fields that can be accessed by the period and the index of the value, e.g. t.0, t.1.
+
+</details>