updates README.md, FW, some names and does some cleanup

fw/hello-world/hello.c

@@ -0,0 +1,24 @@
+#include <stdint.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include <platform.h>
+#include "encoding.h"
+
+int factorial(int i){
+
+	volatile int result = 1;
+	for (int ii = 1; ii <= i; ii++) {
+		result = result * ii;
+	}
+	return result;
+
+}
+
+int main()
+{
+	volatile int result = factorial (10);
+	printf("Factorial is %d\n", result);
+	printf("End of execution");
+	return 0;
+}