Added cmake-pkg-demo to demonstrate using eventpp as CMake package

tests/cmake-pkg-demo/CMakeLists.txt

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+project(eventpppkgdemo)
+
+cmake_minimum_required(VERSION 3.2)
+
+set(CMAKE_CXX_STANDARD 11)
+
+set(TARGET pkgdemo)
+
+set(SRC
+	main.cpp
+)
+
+add_executable(
+	${TARGET}
+	${SRC}
+)
+
+find_package(eventpp CONFIG REQUIRED)
+target_link_libraries(${TARGET} PRIVATE eventpp::eventpp)
+
+# need this because https://github.com/Microsoft/vcpkg/issues/798
+find_path(EVENTPP_INCLUDE_DIR eventpp/eventqueue.h)
+include_directories(${EVENTPP_INCLUDE_DIR})

tests/cmake-pkg-demo/main.cpp

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+// eventpp library
+// Copyright (C) 2018 Wang Qi (wqking)
+// Github: https://github.com/wqking/eventpp
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//   http://www.apache.org/licenses/LICENSE-2.0
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Include the head
+#include "eventpp/eventqueue.h"
+
+#include <iostream>
+
+int main()
+{
+	eventpp::EventQueue<int, void (const std::string &, std::unique_ptr<int> &)> queue;
+
+	queue.appendListener(3, [](const std::string & s, std::unique_ptr<int> & n) {
+		std::cout << "Got event 3, s is " << s << " n is " << *n << std::endl;
+	});
+	// The listener prototype doesn't need to be exactly same as the dispatcher.
+	// It would be find as long as the arguments is compatible with the dispatcher.
+	queue.appendListener(5, [](std::string s, const std::unique_ptr<int> & n) {
+		std::cout << "Got event 5, s is " << s << " n is " << *n << std::endl;
+	});
+	queue.appendListener(5, [](const std::string & s, std::unique_ptr<int> & n) {
+		std::cout << "Got another event 5, s is " << s << " n is " << *n << std::endl;
+	});
+
+	// Enqueue the events, the first argument is always the event type.
+	// The listeners are not triggered during enqueue.
+	queue.enqueue(3, "Hello", std::unique_ptr<int>(new int(38)));
+	queue.enqueue(5, "World", std::unique_ptr<int>(new int(58)));
+
+	// Process the event queue, dispatch all queued events.
+	queue.process();
+
+	return 0;
+}
+

tests/cmake-pkg-demo/readme.md

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+# Demo for CMake package usage
+
+This folder demonstrates how to use eventpp as CMake package.  
+To build the demo program,  
+
+1, Install eventpp as CMake package
+
+1.1, Install eventpp locally.  
+
+In eventpp root folder, run the commands,  
+```
+mkdir build
+cd build
+cmake ..
+sudo make install
+```
+
+2, Then  
+
+```
+mkdir build
+cd build
+cmake .. -G"MinGW Makefiles"
+mingw32-make.exe
+```
+
+If you use other making system rather than MingW, replace the -G generator and mingw32-make.
+