Update 4 files

- /.gitlab/merge_request_templates/new_feature.md
- /.gitlab/merge_request_templates/feature.md
- /.gitlab/merge_request_templates/bugfix.md
- /README.md

.gitlab/merge_request_templates/bugfix.md

-##Bugfix
+## What is the bug
+_Please describe the bug in a couple of words._
+## How do you fix it
+_Describe important implementation details of the bugfix._
+
+## How urgent is the bugfix
+- [ ] I need it as soon as possible
+- [ ] I can wait for a couple of days
+- [ ] None of my current codes is directly affected
+
+## Mandatory steps before review
+- [ ] Gitlab CI passes _(Hint: use `make format` for linting)_ 
+- [ ] Bugfix is covered by additional unit tests
+- [ ] Mark the merge request as ready by removing `Draft:`
+
+# Mandatory steps before merge
+- [ ] Reviewed by a maintainer
+- [ ] Incorporate review suggestions
+
+**You are not supposed to merge this request by yourself, the maintainers of fortan-support take care of this action!**
\ No newline at end of file

README.md

 # Fortran-support library
 This repository is an external library of ICON collecting low-level supporting modules of ICON.
 
+
+## How to contribute
+Please open a merge request and select one of our templates for new features or bugfixes. Detailed instructions how to proceed is provided there.
+
 ## Some notes for developers
 - The `fortran-support` library is only configured by CMake.
 - The `fortran-support` library uses `fprettify` for formatting Fortran codes. Run `make format` before you commit.