update .md files

Author: alexeev-prog

CHANGELOG.md

@@ -1,3 +1,9 @@
+commit 1eba8090030352706d9b03478e7c901416b36b59
+Author: Alexeev Bronislav <alexeev.dev@mail.ru>
+Date:   Mon Aug 4 06:05:04 2025 +0700
+
+    update .md files
+
 commit 786234ec4157a8b5ce04cdd84c00c4d6a3e412a5
 Author: Alexeev Bronislav <alexeev.dev@mail.ru>
 Date:   Mon Aug 4 05:59:51 2025 +0700

README.md

@@ -47,7 +47,7 @@ Built on LLVM 19, it combines low-level memory control with expressive S-express
 
 ### System Requirements
 - LLVM 19 development files
-- C++20 compatible compiler
+- C++20 compatible clang version
 - CPU
 - RAM (optional)
 
@@ -63,14 +63,16 @@ cd sleaf-llvm
 ./build/bin/sleafllvm -h
 ```
 
+### How To Use
+Please, build and install lib. [Instruction here](./BUILDING.md).
+
+You also can read [Hacking](./HACKING.md)
+
 ### Core Technical Features
 | Feature | Technical Implementation | Performance Impact |
 |---------|---------------------------|---------------------|
 | **S-expression Syntax** | Lisp-inspired uniform code representation | Reduced cognitive load, enhanced metaprogramming |
 | **LLVM19 Backend** | Direct LLVM IR generation via C++ API | Near-native execution speed, advanced optimizations |
-| **Static Typing System** | Type annotations (!int, !ptr) with inference | Compile-time safety, zero-cost abstractions |
-| **Memory Control** | Manual allocation (mem-alloc) with scope-based safety | Predictable performance, no GC pauses |
-| **Bitwise Operations** | Native bit-and/bit-or/bit-shl instructions | Hardware-level efficiency |
 | **Cross-Platform** | Single IR → Windows/Linux/macOS binaries | Consistent behavior across platforms |
 
 ### Contribution Guidelines