detz: M0 scaffold

taicpp/tests/test_main.cpp

@@ -0,0 +1,12 @@
+#include "../src/cli/cli.h"
+#include <cassert>
+#include <cstdio>
+int main() {
+    detz::cli::Parser p;
+    const char* a0 = "detz";
+    auto c = p.parse(1, (char**)&a0);
+    assert(c.name == "--help");
+    assert(c.run() == 0);
+    std::puts("M0 OK");
+    return 0;
+}