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/platform_headers/linux_parser.hpp

@@ -0,0 +1,24 @@
+#pragma once
+
+#ifdef __linux__
+#ifndef LINUX_PARSER_HPP
+#include <fstream>
+#include <string>
+
+#include <argument_parser.hpp>
+
+namespace argument_parser {
+    class linux_parser : public base_parser {
+        public: 
+        linux_parser() {
+            std::ifstream command_line_file{"/proc/self/cmdline"};
+            std::getline(command_line_file, program_name, '\0');
+            for(std::string line; std::getline(command_line_file, line, '\0');) {
+                parsed_arguments.emplace_back(line); 
+            }
+        }
+    }; 
+}
+
+#endif 
+#endif

include/parser/platform_headers/macos_parser.hpp

@@ -0,0 +1,27 @@
+#pragma once
+#ifdef __APPLE__
+#ifndef MACOS_PARSER_HPP
+#define MACOS_PARSER_HPP
+
+#include <argument_parser.hpp>
+#include <crt_externs.h>
+#include <string>
+
+namespace argument_parser {
+    class macos_parser : public base_parser {
+        public: 
+        macos_parser() {
+            int argc = *_NSGetArgc();
+            char **argv = *_NSGetArgv();
+            if (argc > 0 && argv != nullptr && argv[0] != nullptr) {
+                program_name = argv[0];
+                for (int i = 1; i < argc; ++i) {
+                    if (argv[i] != nullptr) parsed_arguments.emplace_back(argv[i]);
+                }
+            }
+        }
+    }; 
+}
+
+#endif
+#endif

include/parser/platform_headers/windows_parser.hpp

@@ -0,0 +1,20 @@
+#pragma once
+#ifdef _WIN32
+#ifndef WINDOWS_PARSER_HPP
+
+#include <argument_parser.hpp>
+#include <fstream>
+#include <string>
+
+namespace argument_parser {
+    class windows_parser : public base_parser {
+        public: 
+        windows_parser() {
+        }
+    };
+
+    using parser = windows_parser; 
+}
+
+#endif 
+#endif