feat(parser): add platform-specific parsers and argument conventions

Implement platform-specific parsers for Windows, Linux, and macOS
Add GNU argument convention implementations
Create fake parser for testing purposes
Update CMakeLists to include new headers

include/parser/fake_parser.hpp

@@ -0,0 +1,29 @@
+#pragma once
+
+#ifndef FAKE_PARSER_HPP
+#define FAKE_PARSER_HPP
+
+#include <argument_parser.hpp>
+#include <crt_externs.h>
+#include <initializer_list>
+#include <string>
+
+namespace argument_parser {
+    class fake_parser : public base_parser {
+        public: 
+        fake_parser(std::string const& program_name, std::vector<std::string> const& arguments) {
+            this->program_name = program_name;
+            parsed_arguments = arguments;
+        }
+
+        fake_parser(std::string const& program_name, std::vector<std::string>&& arguments) {
+            this->program_name = program_name;
+            parsed_arguments = std::move(arguments);
+        }
+
+        fake_parser(std::string const& program_name, std::initializer_list<std::string> const& arguments) : 
+            fake_parser(program_name, std::vector<std::string>(arguments)) {}
+    }; 
+}
+
+#endif