Add base code

libc/library.c

@@ -0,0 +1,10 @@
+#include "library.h"
+
+volatile unsigned int *const USART1_PTR = (unsigned int *)0x40011004;
+
+void puts(const char *s) {
+    while(*s != '\0') { /* Loop until end of string */
+        *USART1_PTR= (unsigned int)(*s); /* Transmit char */
+        s++; /* Next char */
+    }
+}

libc/library.h

@@ -0,0 +1 @@
+void puts(const char *s);