Add project files.

source/examples/HotReloadDemo/Shared/CppWidgetApi.h

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+/* CppWidgetApi.h -- a C++ (not extern "C") surface living alongside
+ * PluginApi.h's plain C one, in the SAME plugin build. Every member
+ * function below keeps its real, compiler-mangled name; nothing here
+ * needs special handling by source/HotReload, which classifies
+ * symbols by their type and section, never by what their name looks
+ * like -- see hot_reload.h's "REQUIREMENTS ON A HOT-RELOADABLE
+ * MODULE" and README.md's "Hot reloading C++ symbols" for the full
+ * picture.
+ *
+ * The two methods below are reached two different ways from
+ * Host/Main.cpp, deliberately: see that file's comments for why.
+ */
+#pragma once
+
+class CppWidget
+{
+public:
+	virtual ~CppWidget() = default;
+
+	/* Virtual: Host/Main.cpp calls this through ordinary C++
+	 * polymorphic dispatch (widget->virtualTick(x)) and needs no
+	 * manual symbol lookup at all -- the call compiles down to an
+	 * indirect call through the object's vtable slot, not a direct
+	 * reference to this specific symbol, so it needs no link-time
+	 * dependency on whichever plugin build actually defines it. */
+	virtual int virtualTick(int input);
+
+	/* An ordinary out-of-line method. Calling this as widget->tick(x)
+	 * would compile to a direct call to CppWidget::tick's own mangled
+	 * symbol, which would need the Host to link against a plugin
+	 * build at build time -- exactly what hot-reloading a plugin
+	 * means avoiding. So Host/Main.cpp instead resolves it manually
+	 * by its mangled name via hot_reload_get_symbol(), the same way
+	 * it resolves PluginApi.h's plain C functions. */
+	int tick(int input);
+
+	/* An overloaded operator: mechanically just a function with an
+	 * unusual mangled name, reached the same manual way as tick()
+	 * above. */
+	CppWidget operator+(const CppWidget& other) const;
+};
+
+/* The one entry point Host/Main.cpp looks up by a plain, human-typed
+ * name -- extern "C" here for exactly the reason hot_reload.h
+ * recommends it: something to hand a human-readable name to, without
+ * needing to know or hardcode a mangled string. */
+extern "C" CppWidget* make_cpp_widget();