init: init project layout

.clangd

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+CompileFlags:
+  Add: [-xc++, -Wall, -std=c++20]
+  Compiler: /usr/local/opt/llvm/bin/clang++

.gitignore

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+build

x25.hpp

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+#include <cstdint>
+#include <vector>
+
+namespace LAPB_TYPES {
+
+// Address A/B
+enum class LAPB_ADDRESS : uint8_t {
+  ADDRESS_A = 0x03,
+  ADDRESS_B = 0x01,
+};
+
+} // namespace LAPB_TYPES
+
+namespace LAPB_FRAME {
+// virtual class for LAPB frames
+class lapb_frame {
+private:
+public:
+  LAPB_TYPES::LAPB_ADDRESS address; // Address of the field
+  std::uint8_t control;
+  std::vector<std::uint8_t> data;
+
+  // serialize the frame to a vector of bytes
+  virtual std::vector<std::uint8_t> serialize() = 0;
+  // deserialize the frame from a vector of bytes
+  virtual void deserialize(std::vector<std::uint8_t> &data) = 0;
+};
+
+class lapb_frame_I : public lapb_frame {};
+class lapb_frame_S : public lapb_frame {};
+class lapb_frame_U : public lapb_frame {};
+
+class FRAME_SABM : public lapb_frame_S {};
+class FRAME_DISC : public lapb_frame_S {};
+class FRAME_FRMR : public lapb_frame_S {};
+class FRAME_UA : public lapb_frame_U {};
+class FRAME_DM : public lapb_frame_U {};
+
+}; // namespace LAPB_FRAME