Add README.md

README.md

+# Large-Scale Metrology
+Schema for modeling a Large-Scale Metrology Device in SOIL
+
+## Viewing
+To view the schema, you can use any tool that supports the OpenAPI specification and open the bundled file at [public/openapi.yml](https://git-ce.rwth-aachen.de/wzl-mq-public/soil/schemas/large-scale-metrology/-/blob/76a54aeb9f4ee987ff056d53a4a6c3b32ad2aa7f/public/openapi.yml).
+
+This also works with GitLab's integrated Swagger-Editor.
+
+## Contributing
+To contribute, you can use any editor and edit the files in the folder *OpenAPI*. We recommend Visual Studio Code with the OpenAPI extension.
+Please adhere to the filestructure which decomposes resources into individual files.
+
+## Bundling
+To bundle the files to the public `openapi.yml` file, you can use `swagger-cli`:
+```
+npm install -g swagger-cli
+npx swagger-cli bundle .\OpenAPI\openapi.yml -o .\public\openapi.yml -r -t yaml
+```