feat(test): add minimal trycmd binary

Signed-off-by: Sandro-Alessio Gierens <sandro@gierens.de>

tests/cli_tests.rs

@@ -0,0 +1,5 @@
+#[test]
+fn cli_tests() {
+    trycmd::TestCases::new()
+        .case("tests/cmd/*.toml");
+}