docs: add versioning and maintenance section (#991)

README.md

@@ -14,12 +14,6 @@
 
 ---
 
-## :loudspeaker: ATTENTION:
-
-This package is currently being prepared to reach version 1.0.0 and the development is therefore happening on the [`next` branch](https:/asyncapi/modelina/tree/next), any features must be based and targetting that branch.
-
----
-
 <!-- toc is generated with GitHub Actions do not remove toc markers -->
 
 <!-- toc -->
@@ -268,6 +262,20 @@ Do you need to know how to use the library in certain scenarios?
 
 We have gathered all the examples in a separate folder and they can be found under the [examples folder](./examples). 
 
+## Versioning and maintenance
+As of version 1, Modelina has a very strict set of changes we are allowed to do before it requires a major version change. In short, any changes that change the generated outcome are not allowed as it's a breaking change for the consumer of the generated models. 
+
+Here is a list of changes we are allowed to do that would not require a breaking change:
+- Adding new features (that do not change existing output), such as generators, presets, input processors, etc.
+- Change existing features, by providing options that default to current behavior. This could be a preset that adapts the output based on options, as long as the API of Modelina and the API of the generated models does not have any breaking changes.
+- Bug fixes where the generated code is otherwise unusable (syntax errors, etc).
+
+Breaking changes are allowed and expected at a frequent rate, of course where it makes sense we will try to bundle multiple changes together.
+
+We of course will do our best to uphold this, but mistakes can happen, and if you notice any breaking changes please let us know!
+
+Because of the number of the limited number of champions, only the most recent major version will be maintained.
+
 ## Development
 We try to make it as easy for you as possible to set up your development environment to contribute to Modelina. You can find the development documentation [here](./docs/development.md).