Add feature to restore key settings to default values

Author: sago35

README.md

@@ -159,6 +159,15 @@ Set the key with the key code of `0x7C03`, and then press it.
 Then a reset will restore the default keymap.  
 See [#8](https://github.com/sago35/tinygo-keyboard/pull/8).
 
+## Restore default keymap (tinygo flash)
+
+Restore default keymap each time it is reset by specifying `--tags reset_to_default`.  
+Note that in this setting, any changes made from Vial or other sources will immediately revert to the original setting.  
+
+```
+$ tinygo flash --target wioterminal --size short  --tags reset_to_default ./targets/wiokey
+```
+
 ## Note
 
 The following PR changes are required for all keys to work properly.

reset_to_default.go

@@ -0,0 +1,11 @@
+//go:build reset_to_default
+
+package keyboard
+
+import (
+	"machine"
+)
+
+func init() {
+	machine.Flash.EraseBlocks(0, 1)
+}