[M1] add manifest::parse

src/manifest/manifest.cppm

@@ -1,3 +1,37 @@
 export module cargoxx.manifest;
 
+import std;
 import cargoxx.util;
+
+export namespace cargoxx::manifest {
+
+struct Dependency {
+    std::string name;
+    std::string version_spec;
+    std::vector<std::string> components;
+};
+
+struct BuildSettings {
+    bool warnings_as_errors = false;
+    std::vector<std::string> sanitizers;
+};
+
+enum class Edition { Cpp20, Cpp23, Cpp26 };
+
+struct Package {
+    std::string name;
+    std::string version;
+    Edition edition = Edition::Cpp23;
+    std::vector<std::string> authors;
+    std::optional<std::string> license;
+};
+
+struct Manifest {
+    Package package;
+    std::vector<Dependency> dependencies;
+    BuildSettings build;
+};
+
+auto parse(const std::filesystem::path& path) -> util::Result<Manifest>;
+
+} // namespace cargoxx::manifest