Add Makefile and README.md

Makefile

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+all:
+	latexmk
+
+clean:
+	rm -rf build

README.md

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+# CEL Presentation
+
+LaTeX sources for a presentation held at CEL on the 21.06.2024.
+
+## Build
+
+### Build manually
+
+```bash
+$ make
+```
+
+### Build using docker
+
+1. Build docker image
+   ```bash
+   $ docker build -f dockerfiles/Dockerfile.alpine . -t cel-presentation
+   ```
+1. Build examples
+   ```bash
+   $ docker run --rm -v $PWD:$PWD -w $PWD -u `id -u`:`id -g` cel-presentation make
+   ```