feat(furvm): introduce module, instruction and constant

furvm/include/furvm/module.hpp

@@ -0,0 +1,28 @@
+#ifndef FURVM_MODULE_HPP
+#define FURVM_MODULE_HPP
+
+namespace furvm {
+
+class mod {
+public:
+    mod()  = default;
+    ~mod() = default;
+
+    /**
+     * @brief Move constructor.
+     */
+    mod(mod&&) = default;
+
+    /**
+     * @brief Move constructor.
+     */
+    mod& operator=(mod&&) = default;
+
+    mod(const mod&)            = delete;
+    mod& operator=(const mod&) = delete;
+private:
+};
+
+} // namespace furvm
+
+#endif // FURVM_MODULE_HPP