Update README.md

Author: StevenCreality

README.md

@@ -16,3 +16,7 @@ Klipper is Free Software. See the [license](COPYING) or read the
 [documentation](https://www.klipper3d.org/Overview.html). We depend on
 the generous support from our
 [sponsors](https://www.klipper3d.org/Sponsors.html).
+
+release： https://github.com/CrealityOfficial/Hi_Klipper/releases
+
+firmware-recovery-tool: https://wiki.creality.com/en/k2-flagship-series/k2-plus/firmware-flashing