chore(docs): add CONTRIBUTING guideline

Author: omarabid

CONTRIBUTING.md

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+# Contributing to Pyroscope
+
+Thank you for your interest in contributing to Pyroscope! We welcome all people who want to contribute in a healthy and constructive manner within our community. To help us create a safe and positive community experience for all, we require all participants to adhere to the [Code of Conduct](CODE_OF_CONDUCT.md).
+
+This document is a guide to help you through the process of contributing to Pyroscope.
+
+## Where do I start
+
+* Set up your [development environment](https://pyroscope.io/docs/developer-guide).
+* Read the [style guides](https://pyroscope.io/docs/style-guide) we use.
+* Check out the list of [good first issues](https://github.com/pyroscope-io/pyroscope/issues?q=is%3Aissue+is%3Aopen+label%3A%22good+first+issue%22).