docs: add plugin setup guide

plugin/lib/commonlibf4/include/RE/C/CHAR_NORM.h

@@ -0,0 +1,14 @@
+#pragma once
+
+namespace RE
+{
+	struct CHAR_NORM
+	{
+	public:
+		// members
+		char x;  // 00
+		char y;  // 01
+		char z;  // 02
+	};
+	static_assert(sizeof(CHAR_NORM) == 0x03);
+}