Created the second homework, aka "echoserver."

echoserver/echoserver.h

@@ -0,0 +1,23 @@
+#ifndef ECHOSERVER
+#define ECHOSERVER
+
+// included libraries
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+#include <stdbool.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netdb.h>
+#include <time.h>
+#include <unistd.h>
+#include <errno.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+// data structures
+
+// function prototypes
+
+#endif // ECHOSERVER