Added todos

todo.md

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+## todos
+
+### hardware
+
+- [x] clock
+  - [x] main 2Mhz
+  - [x] 12Mhz pixel clock
+- [ ] memory glue logic
+  - [x] ram
+  - [x] rom
+  - [x] vram
+  - [x] hardware control register
+  - [ ] i/o
+    - [ ] keyboard
+    - [ ] audio
+- [x] video circuit
+- [ ] i/o
+  - [ ] keyboard
+    - [x] matrix/switches
+    - [ ] george-side connections, reading logic
+  - [ ] 3.5mm jack
+  - [ ] microcassette drive (do this after george is finished, add headers & glue logic for interfacing to be hooked up later)
+    - [ ] figure out how each pin on the drive works
+
+### emulator
+
+- [ ] cpu
+  - [ ] instruction functions
+    - [x] implement
+    - [ ] test
+  - [ ] interrupts
+    - [ ] wai instruction
+- [ ] memory
+  - [x] reading
+  - [x] writing
+  - [x] shared access between threads
+  - [ ] banking
+- [ ] video
+  - [x] windowing
+  - [ ] hires mode
+    - [x] display framebuffer contents
+    - [ ] hardware-accurate addressing
+  - [ ] character mode
+    - [ ] ascii decoding
+    - [ ] character rom
+      - [ ] write a utility to translate `cozette.bdf` into a binary to be loaded on the rom
+    - [ ] hardware-accurate addressing
+- [ ] audio
+- [ ] i/o
+  - [ ] keyboard interface
+    - [ ] update keyboard memory register on key down/up