init: setup CLion project and gitignore

.gitignore

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+.idea/
+cmake-build-*/

CMakeLists.txt

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+cmake_minimum_required(VERSION 4.1)
+project(TechArt_Roadmap)
+
+set(CMAKE_CXX_STANDARD 20)
+
+add_executable(TechArt_Roadmap main.cpp)

main.cpp

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+#include <iostream>
+
+// TIP To <b>Run</b> code, press <shortcut actionId="Run"/> or click the <icon src="AllIcons.Actions.Execute"/> icon in the gutter.
+int main() {
+    // TIP Press <shortcut actionId="RenameElement"/> when your caret is at the <b>lang</b> variable name to see how CLion can help you rename it.
+    auto lang = "C++";
+    std::cout << "Hello and welcome to " << lang << "!\n";
+
+    for (int i = 1; i <= 5; i++) {
+        // TIP Press <shortcut actionId="Debug"/> to start debugging your code. We have set one <icon src="AllIcons.Debugger.Db_set_breakpoint"/> breakpoint for you, but you can always add more by pressing <shortcut actionId="ToggleLineBreakpoint"/>.
+        std::cout << "i = " << i << std::endl;
+    }
+
+    return 0;
+}