work on documentation

docs/developers/debugging.md

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+# Debugging
+
+Set the log level with following environment variables:
+
+```sh
+RUST_LOG="debug"
+RUST_BACKTRACE=1
+```
+
+RustiCal also supports exporting opentelemetry traces to inspect with tools like [Jaeger](https://www.jaegertracing.io/).
+To enable you need to compile with the `opentelemtry` (or `debug`) feature and enable opentelemetry in the config with
+
+```toml
+[tracing]
+opentelemetry = true
+```