Started with a rough structure

src/GC/todo.md

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+# Garbage collection
+
+## Algorithm
+
+Potential algorithms:
+- mark & sweep
+    - easy to implement
+    - slow
+- mark & compact
+    - no memory fragmentation
+    - slow
+- stop-copy algorithms (?)
+    - no memory fragmentation
+    - slow
+    - maybe good for FP langs?
+
+## Type hierarchy
+
+- Heap class
+    - Holds all memory
+        - Resizeable array?
+    - Singleton instance
+
+- Allocator class
+    - Allocates chunks of memory
+    - keeps track of chunks that are available and their sizes
+    - Several instances of allocator class with different sizes?
+
+- HeapObj class
+    - parent of all heap objects
+    - contains metadata
+        - size
+        - location
+        - marked bit