Add pre-commit and update README

.github/workflows/pre-commit.yaml

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+name: pre-commit
+
+on: push
+
+jobs:
+  pre-commit:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-python@v3
+      - uses: pre-commit/action@v3.0.0

.pre-commit-config.yaml

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+repos:
+  - repo: https://github.com/python-jsonschema/check-jsonschema
+    rev: 0.27.3
+    hooks:
+      - id: check-metaschema
+        files: ^src/.*\.json$

README.md

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+# dapla-kuben-resource-model
+
+jsonschemas which defines how resources used in kuben are defined. Useful for validation and code generation.
+
+## Contributing
+
+This repository uses [pre-commit](https://pre-commit.com/) to ensure that all schemas are formatted correctly before
+committed.
+Install the pre-commit hooks by running `pre-commit install && pre-commit install-hooks`.
+The pre-commit hooks will also run as a github workflow for each push
+
+Code under generated is generated from the JSON schemas under src. Files here should not be modified manually (only
+exception is pom.xml).
+
+Usual workflow is:
+1. Create branch
+2. Make changes to your schema
+3. Run `pre-commit run --all-files` to format your schema
+4. Commit and push your changes
+5. Github action will run and generate code from your schema
+6. Create a PR and merge it when it is ready
+
+Create release:
+1. Pull latest changes from main
+2. Create a branch with name `release-java`
+3. Push the branch
+4. …
+5. Profit