move systems + update contributing.md

1 files changed, 22 insertions, 0 deletions

diff --git a/src/crepe/system/System.h b/src/crepe/system/System.h
new file mode 100644
index 0000000..ecbb7f5
--- /dev/null
+++ b/src/crepe/system/System.h
@@ -0,0 +1,22 @@
+#pragma once
+
+namespace crepe {
+
+class System {
+public:
+	static System & get_instance();
+	virtual void update() = 0;
+
+protected:
+	System() {};
+	virtual ~System() {};
+
+private:
+	// singleton
+	System(const System &) = delete;
+	System(System &&) = delete;
+	System & operator=(const System &) = delete;
+	System & operator=(System &&) = delete;
+};
+
+} // namespace crepe