docs(ReadMe): explain versioning section

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README.md

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 ## Versioning
 
-TBD
+This section outlines how pre-release versions will be published until the first stable release is achieved and the goals for each stage.
+
+Backward compatibility will not be provided during pre-release stages, as our focus is on progressing toward the stable release. Consequently, breaking changes, such as package upgrades and configuration modifications, may occur without notice.
+
+### Alpha
+
+The goal of the Alpha release is to achieve full integration of the tracing, metering, and logging services provided by the OpenTelemetry SDK.
+
+To accomplish this:
+
+- All services and their dependencies must be fully declared in the bundle configuration.
+- Services should be easily overridden by user-defined service definitions following Symfony's dependency injection principles.
+
+Once the services are functional according to OpenTelemetry SDK capabilities and Symfony's service definitions, this phase will be complete.
+
+### Beta
+
+The goal of the Beta release is to enable tracing instrumentation for a Symfony application, either automatically or selectively.
+
+Instrumentation goals include:
+
+- Allowing instrumentation of Symfony components through defined entry points.
+- Providing automatic (opt-out) instrumentation, where components are instrumented by default, with the option to exclude specific components.
+- Enabling selective instrumentation, allowing users to explicitly choose which components to instrument through provided APIs.
+
+For more details on instrumentation requirements, refer to the [Traces Instrumentation Documentation](https://friendsofopentelemetry.github.io/opentelemetry-bundle/instrumentation/traces.html#components).
+
+This phase will conclude once:
+
+- All components are fully covered by instrumentation.
+- Both automatic and selective configuration methods are implemented.
+
+### Stable
+
+To complete the Stable release, the following goals must be met:
+
+- Full compliance with [OpenTelemetry Trace Semantic Conventions](https://opentelemetry.io/docs/specs/semconv/general/trace/).
+- Stabilization of tracing instrumentation, incorporating feedback and addressing reported issues.
+- Comprehensive test coverage for each component.
+- A complete documentation set, covering tracing services, configurations, and bundle capabilities.
 
 ## Credits