Update file TODO.md

TODO.md

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+TODO
+====
+
+Update docs
+-----------
+
+- minimum requirements for phones
+  - minimum width (long side) 140mm (130mm PCB plus 10mm case)
+  - minimum length (short side) 70mm (65mm PCB plus 5mm case)
+    - _TODO: tyical phone size is 75mm but zenphones can be 68mm; maybe add daughter board or flex cable to CT USB port?_
+
+Add build guide
+---------------
+
+1. Buy electronic parts
+2. Buy PCB and flex cable
+3. Configure QMK firmware
+4. Flash firmware
+5. Test
+5. Print case parts
+6. Assemble
+7. Fun!
+
+
+Mods
+----
+
+- community repos
+  - 3D files and QMK config for additional layouts
+  - 3D files for case mods
+- super long multi space bar
+  - very big keys that cover multiple switches could have multiple functions depending on where you press them