Add hello example

Signed-off-by: Roman Bartosinski <roman@daiteq.com>

hello/Makefile

+# Makefile for hello project
+
+# required libraries in correct order
+LIBS=ins bsp m softfloat ins
+
+# C sources
+SOURCES=hello.c
+
+# all common rules
+include $(TOP)/Makefile.rules

hello/hello.c

+#include <my_printf.h>
+#include <leon-myuart.h>
+
+int main(void)
+{
+  init_uart();
+
+  printf("* Hello World\n\n");
+  return 0;
+}