chore(RELEASE): Document the process

RELEASE.md

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+# Release Process
+
+## Overview
+
+The Prometheus RDS exporter project has the following two components:
+
+- Prometheus RDS exporter binary
+- Docker image
+- Helm chart
+- Debian package
+
+This repository is the home for both of the above components.
+
+## Versioning Strategy
+
+The project is using [Semantic Versioning](https://semver.org):
+
+- MAJOR version may introduce incompatible changes
+- MINOR version introduces functionality in a backward compatible manner
+- PATCH version introduces backward compatible bug fixes
+
+## Releasing a New Version
+
+The following steps must be done by one of the Prometheus RDS Exporter Maintainers:
+
+- Verify the CI tests pass before continuing.
+- Create a tag using the current `HEAD` of the `main` branch by using `git tag v<major>.<minor>.<patch>`
+- Push the tag to upstream using `git push upstream v<major>.<minor>.<patch>`
+- This tag will kick-off the [GitHub Release Workflow](https://github.com/qonto/prometheus-rds-exporter/blob/main/.github/workflows/build.yaml), which will auto-generate GitHub release contains multi-architecture binaries and Debian package, publish new release of amd64/arm64 docker images and Helm charts into the container registry