examples: add initial examples for RFC

Add hello_world and random(generate UUID) examples

Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>
Reviewed-by: Jerome Forissier <jerome.forissier@linaro.org>
Signed-off-by: Igor Opaniuk <igor.opaniuk@linaro.org>
diff --git a/hello_world/host/Makefile b/hello_world/host/Makefile
new file mode 100644
index 0000000..17f14fe
--- /dev/null
+++ b/hello_world/host/Makefile
@@ -0,0 +1,25 @@
+CC      = $(CROSS_COMPILE)gcc
+LD      = $(CROSS_COMPILE)ld
+AR      = $(CROSS_COMPILE)ar
+NM      = $(CROSS_COMPILE)nm
+OBJCOPY = $(CROSS_COMPILE)objcopy
+OBJDUMP = $(CROSS_COMPILE)objdump
+READELF = $(CROSS_COMPILE)readelf
+
+OBJS = main.o
+
+CFLAGS += -Wall -I../ta/include -I$(TEEC_EXPORT)/include -I./include
+#Add/link other required libraries here
+LDADD += -lteec -L$(TEEC_EXPORT)/lib
+
+BINARY = optee_hello_world
+
+.PHONY: all
+all: $(BINARY)
+
+$(BINARY): $(OBJS)
+	$(CC) -o $@ $< $(LDADD)
+
+.PHONY: clean
+clean:
+	rm -f $(OBJS) $(BINARY)