Include integration test

Author: alandefreitas

test/integration/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.14)
+project(myproject VERSION 1.0.1)
+set(CMAKE_CXX_STANDARD 17)
+
+find_package(Matplot++)
+
+if (Matplot++_FOUND)
+    add_executable(myprogram main.cpp)
+    target_link_libraries(myprogram PRIVATE Matplot++::matplot)
+endif()

test/integration/main.cpp

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+//
+// Created by Alan Freitas on 05/10/20.
+//
+
+#include <matplot/matplot.h>
+
+int main() {
+    std::vector<double> x = {1,2,3,4,5};
+    matplot::plot(x);
+    matplot::show();
+}