Convert table image to markdown table

docs/group_assignments/group2/assignment4.md

@@ -99,6 +99,12 @@ XIAO RP2040, XIAO ESP32C3, and XIAO SAMD2 are
     
 Since the processor clock speeds are different, it is interesting to calculate the signal frequency per processor speed.
 This is shown in the following table.
-![signalperclockspeed](./assets/assignment4/schematic_photos/speeds_table.jpg)
+
+||read in-out speed (MHz)|processor speed (MHz)|ratio|
+|---|---|---|---|
+|xiao RP2040|10.23|133|0.07692|
+|xiao ESP32C3|3.81|160|0.02375|
+|xiao SAMD21|3.69|49|0.07688|
+
 Table: Signal frequencies, the processor clock speeds, and the ratio of the signal frequency to the processor speed.