Create readme.md

readme.md

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+# Implementation
+
+1. Allocate and Deallocate Physical Pages
+	**Functionality**:
+
+-   `allocatePhysicalPage()` uses `mmap` to allocate a 4KB physical page.
+-   Destructor `~MemoryManager()` uses `munmap` to deallocate physical pages.
+
+```
+void* allocatePhysicalPage() {
+    void* page = mmap(nullptr, PAGE_SIZE, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+    if (page == MAP_FAILED) {
+        std::cerr << "Error while mmapping page " << page << ": " << std::strerror(errno) << std::endl;
+        return nullptr;
+    }
+    physicalPages_.push_back(page);
+    return page;
+}
+
+MemoryManager::~MemoryManager() {
+    for (void* page : physicalPages_) {
+        if (munmap(page, PAGE_SIZE) != 0) {
+            std::cerr << "Error unmapping page at " << page << ": " << std::strerror(errno) << std::endl;
+        }
+    }
+}
+```