Create CONTRIBUTING.md

Contribution guidelines are a way to communicate how people should contribute to this project.

This is also a requirement in CNCF CLOMonitor checks: https://clomonitor.io/projects/cncf/cilium#ebpf

Signed-off-by: Sandipan Panda <[email protected]>

Author: sandipanpanda

CONTRIBUTING.md

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+# Contributing to ebpf-go
+
+Want to contribute to ebpf-go? There are a few things you need to know.
+
+We wrote a [contribution guide](https://ebpf-go.dev/contributing/) to help you get started.