Create README.md

README.md

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+
+Complete implementation of HPACK (Header Compression for HTTP/2, fully compliant RFC 7541)
+
+encode:
+
+```cpp
+#include <hpack/encoder.hpp>
+
+void encode_my_headers(hpack::encoder& enc, std::vector<hpack::bytes>& bytes;) {
+  // memory effective by default
+  enc.encode("name", "value", std::back_inserter(bytes));
+  // or by hands
+  enc.encode_header_fully_indexed(hpack::static_table_t::status_200, std::back_inserter(bytes));
+}
+
+```
+
+decode
+
+```cpp
+#include <hpack/decoder.hpp>
+
+void decode_my_headers(hpack::decoder& d, std::span<const hpack::byte_t> bytes) {
+  hpack::decode_headers_block(e, bytes, [&](std::string_view name, std::string_view value) {
+    // use name/value somehow
+  });
+}
+
+```
+
+adding with cmake:
+
+Preferred way with [CPM](https://github.com/cpm-cmake/CPM.cmake)
+
+```cmake
+
+CPMAddPackage(
+  NAME HPACK
+  GIT_REPOSITORY https://github.com/kelbon/HPACK
+  GIT_TAG origin/master
+)
+
+target_link_libraries(MyTargetName hpacklib)
+
+```
+
+simple way with fetch content:
+
+```cmake
+
+include(FetchContent)
+FetchContent_Declare(
+  HPACK
+  GIT_REPOSITORY https://github.com/kelbon/HPACK
+  GIT_TAG        origin/master
+)
+FetchContent_MakeAvailable(HPACK)
+target_link_libraries(MyTargetName hpacklib)
+
+```