Full readme

README.md

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 CleanroomIDF is a template for the development with cleanroom, based on [IdeallandFramework](https://github.com/IdeallandEarthDept/IdeallandFramework), [TemplateDevEnv](https://github.com/CleanroomMC/TemplateDevEnv/tree/master) and [1.12.2-FG6-Template](https://github.com/kappa-maintainer/1.12.2-FG6-Template)
 
-Click `Use this template` or download the codes for the setup.
+Click `Use this template` or download the codes for the setup.
+
+### About the branchs
+
+There are many branchs here.
+
+`main` is the main branch
+
+`full` is the main with the codes of idf
+
+the branchs start with `_` is the contribution to upstream, do not use!
+
+### About the action
+
+The action is used for check.