docs: add Releasing and Contributing

CONTRIBUTING.md

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+# Contributing to Raygun4ReactNative
+
+## Project and library organisation
+
+Building the project requires [Node.js](https://nodejs.org).
+
+The project should work on all LTS Node versions.
+
+All required React Native packages will be installed through `npm`.
+
+- The `raygun4reactnative` package is in the `sdk` folder.
+- The `demo` folder contains an example app based on React Native.
+- The `ExpoDemo` folder contains an example app based on Expo.
+
+## Building and running
+
+The recommended IDE for working on this project is Visual Studio Code.
+
+Setup instructions can be found in the `sdk` folder in the `README.md` file.
+
+### Tests
+
+To run tests, in the `sdk` folder run `npm run test` or run all tests from VSCode.
+
+### Code analysis
+
+To check the code, in the `sdk` folder run `npm run eslint`.
+
+### Formatting
+
+To format the code, in the `sdk` folder run `npm run prettier`.
+
+### Running examples
+
+Instructions on how to run the examples can be found in their respective folders.
+
+## 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/raygun4reactnative
+into your own GitHub account.
+
+### Create a new branch
+
+Create a local branch off `master` in your fork,
+named so that it explains the work in the branch.
+
+Do not submit a PR directly from your `master` branch.
+
+### Open a pull request
+
+Submit a pull request against the main repositories' `master` 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.
+

RELEASING.md

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+# Releasing Raygun4ReactNative
+
+Raygun4ReactNative is published on npmjs.com as [`raygun4reactnative`](https://www.npmjs.com/package/raygun4reactnative).
+## Semantic versioning
+
+This package follows semantic versioning.
+
+Given a version number MAJOR.MINOR.PATCH (x.y.z), increment the:
+
+- MAJOR version when you make incompatible changes
+- MINOR version when you add functionality in a backward compatible manner
+- PATCH version when you make backward compatible bug fixes
+
+To learn more about semantic versioning check: https://semver.org/
+
+## Preparing for release
+
+### Release branch
+
+Create a new branch named `release/x.y.z` 
+where `x.y.z` is the Major, Minor and Patch release numbers.
+
+### Update version
+
+Update the `version` in the `src/package.json` file.
+
+### Run npm install
+
+Run `npm install` in the `sdk` to update the version in the `package-lock.json`.
+
+### Update CHANGELOG.md
+
+Add a new entry in the `CHANGELOG.md` file.
+
+Obtain a list of changes using the following git command:
+
+```
+git log --pretty=format:"- %s (%as)"
+```
+
+### Run publish dry-run
+
+Run a publish dry-run in the `sdk` to ensure no errors appear:
+
+```
+npm publish --dry-run
+```
+
+### Commit and open a PR
+
+Commit all the changes into a commit with the message `chore: Release x.y.z`
+where `x.y.z` is the Major, Minor and Patch release numbers.
+
+Then push the branch and open a new PR, ask the team to review it.
+
+## Publishing
+
+### PR approval
+
+Once the PR has been approved, you can publish the provider.
+
+### Publish to npmjs.com
+
+Run the publish command without `dry-run`.
+You will need an account in npmjs.com to publish, 
+as well as being part of the [Raygun organization](https://www.npmjs.com/~raygunowner).
+
+```
+npm publish
+```
+
+Now the package is available for customers.
+
+### Merge PR to master
+
+With the PR approved and the package published, 
+squash and merge the PR into `master`.
+
+### Tag and create Github Release
+
+Go to https://github.com/MindscapeHQ/raygun4reactnative/releases and create a new Release.
+
+GitHub will create a tag for you, you don't need to create the tag manually.
+
+You can also generate the release notes automatically.
+