feat(journal): update week 5

journal/week5.typ

@@ -0,0 +1,22 @@
+#import "template.typ": week, day
+
+#show: week.with(num: 5)
+
+#day(1)
+
+- Implement generics
+- Refactor type checker
+- Create demo program
+
+#day(2)
+
+- Define formal calculus rules
+- Add type params to extend block
+
+#day(3)
+
+- Rework extend block for methods
+  - Goal: allow defining any method on types
+  - Issues:
+    - `GetExpr` can reference either a property on a `ComplexType` or a method.
+    - A method (or function) can be overloaded, for example ```py list[T].__getitem__(int) -> T``` and ```py list[T].__getitem__(slice) -> list[T]```