chore: Add documentation for contributors (#9)

* chore: Add documentation for contributors

* chore: add PR template

* chore: add codeowners

.github/CODEOWNERS

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+# These owners will be the default owners for everything in
+# the repo. Unless a later match takes precedence,
+# below groups will be requested for
+# review when someone opens a pull request.
+
+*  @splunk/o11y-synthetics-approvers @splunk/o11y-synthetics-maintainers

.github/pull_request_template.md

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+<!--- Provide a general summary of your changes in the Title above -->
+
+## Description
+<!--- Describe your changes in detail -->
+
+## Motivation and Context
+<!--- Why is this change required? What problem does it solve? -->
+<!--- If it fixes an open issue, please link to the issue here. -->
+
+## Testing
+<!--- Please describe any tests added or performed. -->
+
+## Documentation
+<!--- Has documentation been updated? Chart updates might require helm docs update. -->

RELEASE.md

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+# Contributing to Synthetics Helm Charts
+
+This guide will help you through the process of making PRs and releasing a new version of the Synthetics Helm Charts.
+
+## Prerequisites
+
+Before you begin, ensure you have the following tools installed:
+
+- [Helm](https://helm.sh/docs/intro/install/)
+- [Make](https://www.gnu.org/software/make/)
+- [Helm-docs](https://github.com/norwoodj/helm-docs?tab=readme-ov-file#installation)
+- [Helm unittest](https://github.com/helm-unittest/helm-unittest?tab=readme-ov-file#install)
+- [Chart Testing](https://github.com/helm/chart-testing?tab=readme-ov-file#installation)
+
+You can also install the above listed tools using the following command on macOS:
+
+```sh
+make install-tools
+```
+
+This repository also uses pre-commit hooks to ensure that the code is formatted correctly before changes are committed. Users are recommended to install pre-commit.
+
+## Making Changes
+
+### Pull Requests
+
+Contributors should open a PR with their proposed changes. The PR title must include scope of the changes, for example, `feat: Add new feature`, `fix: Fix issue`, `chore: Update dependencies`, etc. The PR description should include a brief summary of the changes and any additional context that might be helpful for reviewers.
+
+### Linting
+
+After making changes to the Helm chart, you can lint the chart using the following command:
+
+```sh
+make lint
+```
+
+### README
+
+The chart README is generated using the `helm-docs` tool. The tool generates a values table from comments in `values.yaml` file and uses the `README.md.gotmpl` to generates the chart's `README.md` file. After updates to the helm chart or `README.md.gotmpl` inside a chart directory, contributors must run below helm-docs script to generate the updated `README.md` file. Contributors should not edit the README.md file manually.
+
+To update the README, run the following command which will start a docker container and run helm-docs on the chart:
+
+```sh
+make docker-docs
+```
+
+If you have helm-docs installed locally, you can run the following command:
+
+```sh
+make docs
+```
+
+### Unit Tests
+
+This repository includes unit tests for helm charts that are written using the [helm unittest](https://github.com/helm-unittest/helm-unittest) plugin. The tests are located in the `tests/unittests` directory. Contributors should add tests for new features or bug fixes which involve using helm's templating engine. The test API documentation for the plugin can be found [here](https://github.com/helm-unittest/helm-unittest/blob/main/DOCUMENT.md).
+
+You can run the tests using the following command:
+```sh
+make unittest
+```
+
+### Versioning
+The helm chart version should be updated in the `Chart.yaml` file. The version should follow the [Semantic Versioning](https://semver.org/) guidelines.
+
+To bump the application version, update the `appVersion` field in the `Chart.yaml` file to match the new runner container image version.
+
+### Releasing the Chart
+
+To release a new version of the Helm chart, follow these steps:
+
+1. **Update the Chart Version**:
+   - Update the `version` field in the `Chart.yaml` file.
+
+2. **Commit the Version Update**:
+   - Commit the version update with a message like `chore: Bump chart version to x.y.z`.
+
+   ```sh
+   git add Chart.yaml
+   git commit -m "chore: Bump chart version to x.y.z"
+   ```
+
+3. **Create a Pull Request**:
+    - Push the changes to your branch and create a pull request.
+    - Ensure that your pull request passes all checks.
+
+4. **Merge PR and Automatic Release**:
+    - Once the pull request is reviewed and approved, a maintainer will merge it into the main branch.
+    - Upon merging the pull request, a GitHub Actions workflow will be triggered to automatically package and release the new version of the Helm chart. The new version will be available in the GitHub Releases section.