Added hello world project

hello-world/Makefile

@@ -0,0 +1,14 @@
+
+TARGET = hello
+C_SRCS += $(wildcard *.c) 
+#CFLAGS += -O2 
+#-fno-builtin-printf
+
+BOARD=freedom-e300-hifive1
+LINK_TARGET=link
+RISCV_ARCH=rv32imac
+RISCV_ABI=ilp32
+
+TOOL_DIR?=/opt/riscv/FreedomStudio/20180122/SiFive/riscv64-unknown-elf-gcc-20171231-x86_64-linux-centos6/bin
+BSP_BASE = ./bsp
+include $(BSP_BASE)/env/common.mk