add 2 examples

.gitignore

+# Prerequisites
+*.d
+
+# Compiled Object files
+*.slo
+*.lo
+*.o
+*.obj
+
+# Precompiled Headers
+*.gch
+*.pch
+
+# Compiled Dynamic libraries
+*.so
+*.dylib
+*.dll
+
+# Fortran module files
+*.mod
+*.smod
+
+# Compiled Static libraries
+*.lai
+*.la
+*.a
+*.lib
+
+# Executables
+*.exe
+*.out
+*.app
+
+./build
+./build2
+build
+build2
+./build3
+./build4
+build3
+build4
+build_juwels
+./build_juwels
+CMakeLists.txt.user
+CMakeCache.txt
+CMakeFiles
+CMakeScripts
+Testing
+Makefile
+cmake_install.cmake
+install_manifest.txt
+compile_commands.json
+CTestTestfile.cmake
+_deps

0_hello_world/hello_world.cpp

+#include <omp.h>
+#include <stdio.h>
+
+int main(int argc, char* argv[])
+{
+    int nthreads;
+#pragma omp parallel
+    printf("Hello World from thread = [%d]\n", omp_get_thread_num());
+}
+

1_integral/integral.cpp

+#include <math.h>
+#include <iostream>
+#include <omp.h>
+#include <chrono>
+
+#define from 0.0f
+#define to 2.0f
+#define parts 999999999
+#define step ((to - from) / parts)
+#define x (from + (step / 2.0f))
+
+int main()
+{
+    double integralSum = 0;
+    int i;
+
+    std::chrono::high_resolution_clock::time_point t1 = std::chrono::high_resolution_clock::now();
+
+#pragma omp parallel for reduction(+:integralSum)
+    for (i = 1; i < (parts+1); ++i)
+    {
+        integralSum = integralSum + (step * fabs(pow((x + (step * i)),2) + 4));
+    }
+
+    std::chrono::high_resolution_clock::time_point t2 = std::chrono::high_resolution_clock::now();
+
+    std::chrono::duration<double> time_span = std::chrono::duration_cast<std::chrono::duration<double>>(t2 - t1);
+
+    std::cout << "Integral sum = " << integralSum << ", time = " << time_span.count() << " s." << std::endl;
+
+        return 0;
+}
+