Add ESP32C3 RISC-V stub
diff --git a/src/kernel/riscv32/main.c b/src/kernel/riscv32/main.c
new file mode 100644
index 0000000..9603292
--- /dev/null
+++ b/src/kernel/riscv32/main.c
@@ -0,0 +1,13 @@
+#include "kint.h"
+#include "serial.h"
+
+void kmain(uint mhartid)
+{
+	init_serial();
+
+	serial_write("Hello from Bluejay!\r\n");
+	
+	while (true)
+	{
+	}
+}