fix(heap, readme): MemoryAllocator => Heap, update readme

README.md

@@ -1,14 +1,23 @@
 # OS220
+Research kernel in C++
 
+### Implemented (kernel)
+- Global Descriptor Table
+- Output via Flanterm by mintsuki
+- Memory map scanning
+- Kernel-mode heap allocator
 
-# Roadmap
-[x] GDT
+### In progress (kernel)
+- ISR handling (interrupts)
+- Virtual memory paging
+- UEFI runtime service support
+- ACPI & AML support
 
-[ ] IDT/ISRs/Interrupts
+### Implemented (kernel C++ library)
+- new/delete operators via kernel heap
+- String stream (`cstringstream`)
+- Console output stream (`kout`, `kerr`)
 
-[ ] Page frame allocator
-
-[ ] Paging
-
-[ ] Heap allocator
-...
+### In progress (kernel C++ library)
+- Vector/array class
+- String class