Update readme, create factorial_examples folder and move existing code into it

factorial.c

@@ -1,37 +0,0 @@
-#include <stdio.h>
-#include <stdlib.h>
-#include <stddef.h>
-#include <stdint.h>
-
-uintmax_t factorial(uintmax_t n) {
-	if(n < 2)
-		return 1;
-	return n * factorial(n-1);
-}
-
-uintmax_t factorial_iter(uintmax_t n) {
-	uintmax_t fact = 1;
-	uintmax_t i = 2;
-	while(i <= n) {
-		fact *= i;
-		i++;
-	}
-	return fact;
-}
-
-int main(void) {
-	size_t bufsize = 1024;
-	char **lineptr = calloc(bufsize, sizeof(char));
-	fputs("Enter number to factor: ", stdout);
-	int err = getline(lineptr, &bufsize, stdin);
-	if(err == -1) {
-		puts("Error reading line from user input");
-		return 1;
-	}
-
-	uintmax_t user_input = abs(atoi(*lineptr));
-	printf("\nRecursive factorial for number: %ju\n", factorial(user_input));
-	printf("Iterative factorial for number: %ju\n", factorial_iter(user_input));
-	free(lineptr);
-	return 0;
-}