Keep the colleague's microbu-esp32c5 tree in this repository

obu-firmware builds against vanetza-idf from microbu-esp32c5/external, but that tree was gitignored, so a clone of this repository could not build the firmware it ships. It is now committed here as ordinary files in its own folder, microbu-esp32c5/: the colleague's commit cf4b99f plus the V2X2MAP bridge's signature verification (--trust) used on the bench. Nothing is fetched from or pushed to the colleague's repository; this repository and its remotes carry everything. The folder's own .gitignore keeps build output, downloaded components and private key material out, as it did there; the committed file set is identical to that repository's tracked files. The ESP32-C5 is still flashed from obu-firmware/, which only takes vanetza-idf from microbu-esp32c5/, so the two stay separate folders. FLASHING.md says how to take a newer version of the colleague's tree (copy it over the folder, rebuild, test, commit).
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+# Benchmark
+
+*Benchmark* is a tool to benchmark some components of Vanetza.
+At the moment, benchmarks for signing and validating packets exist.
+
+## Installation
+
+Benchmarks are not built by default, so you need to enable them explicitly.
+Run `cmake -D BUILD_BENCHMARK=ON ..` in your build directory to do so and start the build process again.
+You should be able to find `bin/benchmark` in your build directory afterwards.
+
+## Running
+
+You can run `bin/benchmark --help` to get a list of available benchmarks.
+You can run these with `bin/benchmark <name>` then.
+
+## Acknowledgement
+
+This application has been initially developed [Niklas Keller](https://github.com/kelunik).