docs: add CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing to Raygun4Net-Examples
+
+Instructions on how to build and run this project are located in the `README.md`.
+
+## How to contribute?
+
+This section is intended for external contributors not part of the Raygun team.
+
+Before you undertake any work, please create a ticket with your proposal,
+so that it can be coordinated with what we're doing.
+
+If you're interested in contributing on a regular basis,
+please get in touch with the Raygun team.
+
+### Fork the repository
+
+Please fork the main repository from https://github.com/MindscapeHQ/raygun4net-examples
+into your own GitHub account.
+
+### Create a new branch
+
+Create a local branch off `main` in your fork,
+named so that it explains the work in the branch.
+
+Do not submit a PR directly from your `main` branch.
+
+### Open a pull request
+
+Submit a pull request against the main repositories' `main` branch. 
+
+Fill the PR template and give it a title that follows the [Conventional Commits guidelines](https://www.conventionalcommits.org/en/v1.0.0/).
+
+### Wait for a review
+
+Wait for a review by the Raygun team.
+The team will leave you feedback and might ask you to do changes in your code.
+
+Once the PR is approved, the team will merge it.
+