Added more tips/reminders for later

README.markdown

@@ -40,6 +40,8 @@ More information here: @ref documentationGuide "Documentation Guide"
 - Document things as we go
 - Need to make sure we have a BOM
 - Free samples for parts from manufacturers
+- Make peripherals like output on one side and inputs on the other
+- Use SPI Chip Select as a separate command (Use 3-pin SPI and then just use GPIO for Chip Select)