Add multilingual language and systems learning tracks

ceb/cpp-practice-20261101/lesson-2/main.cpp

@@ -0,0 +1,11 @@
+#include <iostream>
+#include <vector>
+#include <string>
+#include <cassert>
+
+int main() {
+    std::vector<std::string> plan{"Read", "Test"};
+    auto copy = plan;
+    copy.push_back("Explain");
+    std::cout << plan.size() << " " << copy.size() << "\n";
+}