Add project files

source/BreezeCore/include/breeze/Git.hpp

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+#pragma once
+
+#include <filesystem>
+#include <string>
+#include <vector>
+
+#include "breeze/Version.hpp"
+
+/// The little of git the CLI needs: listing the version tags of a repository and exporting one
+/// tag's files. Repositories are URLs or local paths; git itself must be installed.
+namespace breeze::git
+{
+
+	struct Tag
+	{
+		/// The tag as written in the repository, e.g. "v1.2.0".
+		std::string name;
+		Version version;
+	};
+
+	/// Is `source` something git can clone (a URL, or a local repository) rather than a plain
+	/// directory?
+	bool isRepository(const std::string& source);
+
+	/// The tags of the repository that are versions, in no particular order. Throws Error when the
+	/// repository can't be reached.
+	std::vector<Tag> versionTags(const std::string& repository);
+
+	/// Exports the files of `tag` (the default branch's tip when empty) into `destination`, without
+	/// the repository's own history.
+	void exportTree(const std::string& repository, const std::string& tag,
+					const std::filesystem::path& destination);
+
+}