Move docker files to the Dockerfiles dir

README.md

@@ -20,3 +20,27 @@ Rules:
 * Please provide an adequate entry in the Wiki for each non-trivial code contribution.
 
 For additional information, please refer to the [Wiki](https://gitea.dmz.rs/sborovic/dmzOS/wiki).
+
+# Instructions for running the utilities
+
+## c_toolchain utility docker image
+
+This is the consistent C toolchain environment, containing all the tools needed to run and develop the project.
+
+Dockerfile: `dockerfile.c_toolchain`
+Run the docker-compose command to get a `bash` shell that is bound to the `dmzOS` directory:
+```docker
+docker-compose run --rm c_toolchain
+```
+
+Any changes in the container `dmzOS` directory will be reflected in the local `dmzOS` directory.
+
+The image contains `indent` and `clang-format` as `C` code formatters.
+
+A .vimrc file is automatically part of the image, and it contains a rule to make vim run the following formatting command on buffer save:
+```bash
+indent -kr -ts4 %
+```
+This is using the Kernighan and Ritchie code styling, as well as identations with 4 spaces.
+
+If you want to use your own `.vimrc`, please replace the existing `.vimrc` file inside the `config` directory with it.