Reapply "lab6 bash exercises"

This reverts commit 8aea945eed.

include/reader_writer.h

@@ -1,30 +0,0 @@
-//
-// Created by lumijiez on 12/8/24.
-//
-
-#ifndef READER_WRITER_H
-#define READER_WRITER_H
-
-#include <semaphore.h>
-#include <fstream>
-
-class ReaderWriter {
-public:
-    ReaderWriter(int numReaders, int numWriters, std::string  filename);
-    ~ReaderWriter();
-    void run();
-
-private:
-    int numReaders;
-    int numWriters;
-    std::string filename;
-
-    sem_t resourceAccess{};
-    sem_t readCountAccess{};
-    int readCount;
-    int writeCount;
-
-    static void* reader(void* arg);
-    static void* writer(void* arg);
-};
-#endif //READER_WRITER_H