Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+## Set up your machine
+
+`incidentio-exporter` is written in [Go](https://golang.org/).
+
+Prerequisites:
+
+- [Go 1.22+](https://go.dev/doc/install)
+
+Clone `incidentio-exporter` anywhere:
+
+```sh
+git clone [email protected]:dirsigler/incidentio-exporter.git
+```
+
+## Test your change
+
+Add your changes to the code and build the binary as well as Dockerimage locally.
+You can use the example Docker Compose stack in [./examples/docker/](./examples/docker/) to see the changes live.
+
+Else verify that a `curl http://localhost:9193/metrics` responds with the desired Prometheus metrics.
+
+## Create a commit
+
+Commit messages should be well formatted.
+
+## Submit a pull request
+
+Push your branch to your `incidentio-exporter` fork and open a pull request against the main branch.