Update README

README.md

@@ -208,6 +208,23 @@ PGPainless is developed in - and accepts contributions from - the following plac
 * [Github](https://github.com/pgpainless/pgpainless)
 * [Codeberg](https://codeberg.org/PGPainless/pgpainless)
 
+We are using SemVer (MAJOR.MINOR.PATCH) versioning, although MINOR releases could contain breaking changes from time to time.
+
+If you want to contribute a bug fix, please check the `release/X.Y` branches first to see, what the oldest release is
+which contains the bug you are fixing. That way we can update older revisions of the library easily.
+
+### Branches
+* `release/X.Y` contains the state of the latest `X.Y.Z` PATCH release + next PATCH snapshot definition.
+* `master` contains the state of the latest MINOR release + some smaller changes that will make it into the next PATCH release.
+* `development` contains new features that will make it into the next MINOR release.
+
+#### Example:
+Latest release: 1.1.3
+* `release/1.0` contains the state of `1.0.5-SNAPSHOT`
+* `release/1.1` contains the state of `1.1.4-SNAPSHOT`
+* `master` contains the state `release/1.1` plus patch level changes that will make it into `1.1.4`.
+* `development` contains the state which will at some point become `1.2.0`.
+
 Please follow the [code of conduct](CODE_OF_CONDUCT.md) if you want to be part of the project.
 
 ## Acknowledgements