Merge pull request #10 from Zelzahn/reference-hardware

Add reference hardware

README.md

@@ -14,11 +14,15 @@ wasi-i2c is currently in [Phase 1](https://github.com/WebAssembly/WASI/blob/main
 
 ### Portability Criteria
 
-WASI-I2C must have at least an independent implementation for the following platforms: 
-- Linux (ARM)
-- Linux (RISC-V)
-- RTOS (Zephyr or FreeRTOS)
-- Microcontroller implementation (Cortex M4 as a lowerbound)
+WASI-I2C must have an implementation for at least the following platforms:
+
+| Platform                  | Architecture  | Reference Hardware     |
+| ------------------------- | ------------- | ---------------------- |
+| Linux                     | ARM           | Raspberry Pi 3 Model B |
+| RTOS (NuttX or Zephyr)    | RISC-V        | ESP32-C3               |
+| RTOS (Zephyr or FreeRTOS) | ARM32         | Nucleo F412ZG          |
+
+Furthermore, the interface should be designed in such a way to use as little memory as reasonably possible, to ensure enough RAM on these boards is still available for the applications.
 
 ### Introduction