Exercises: Add interceptor library

exercises/task22/libFoo/foo.cpp

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+#include "foo.hpp"
+
+#include <iostream>
+#include <limits>
+#include <random>
+
+namespace foo {
+
+int random_number()
+{
+	static std::random_device device;
+	static std::mt19937 rng(device());
+	static std::uniform_int_distribution<int> dist(0, std::numeric_limits<int>::max());
+
+	return dist(rng);
+}
+
+void just_a_print()
+{
+	std::cout << "Just a print to stdout, nothing else\n";
+}
+
+} // end namespace foo

exercises/task22/libFoo/foo.hpp

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+#ifndef FOO_HPP
+#define FOO_HPP
+
+namespace foo {
+
+int random_number();
+
+void just_a_print();
+
+} // end namespace foo
+
+#endif // FOO_HPP