Initial commit: add Mergify pre-commit hook and README

Author: JulianMaurin

.pre-commit-hooks.yaml

@@ -0,0 +1,14 @@
+- id: validate-mergify-config
+  name: Validate Mergify configuration
+  description: Validate Mergify configuration files against the official schema
+  entry: check-jsonschema --schemafile https://docs.mergify.com/mergify-configuration-schema.json
+  language: python
+  additional_dependencies:
+    - check-jsonschema==0.33.3
+  files: |
+    (?x)
+    ^(
+      \.mergify\.(yml|yaml)
+      | \.mergify/config\.(yml|yaml)
+      | \.github/mergify\.(yml|yaml)
+    )$

README.md

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+## Mergify pre-commit hook
+
+Official pre-commit hooks for Mergify. Validate Mergify configuration files.
+
+### Usage
+
+Add the following to your `.pre-commit-config.yaml`:
+
+```yaml
+repos:
+  - repo: https://github.com/Mergifyio/mergify-pre-commit
+    rev: 1.0.0
+    hooks:
+      - id: validate-mergify-config
+```
+
+It uses `check-jsonschema` under the hood with Mergify's official schema:
+
+```
+https://docs.mergify.com/mergify-configuration-schema.json
+```
+
+### Customization
+
+- To pass extra arguments to `check-jsonschema`, use `args` in your config. For example, to enable strict mode:
+
+```yaml
+repos:
+  - repo: https://github.com/Mergifyio/mergify-pre-commit
+    rev: 1.0.0
+    hooks:
+      - id: validate-mergify-config
+        args: ["--strict"]
+```

pyproject.toml

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+[build-system]
+requires = ["setuptools>=61"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "mergify-pre-commit"
+version = "1.0.0"
+description = "Official pre-commit hooks for Mergify (validate Mergify config)."
+readme = "README.md"
+requires-python = ">=3.8"
+authors = [
+  { name = "Mergify", email = "[email protected]" }
+]
+keywords = ["pre-commit", "mergify", "check-jsonschema", "schema"]
+
+[project.urls]
+Homepage = "https://github.com/Mergifyio/mergify-pre-commit"
+Repository = "https://github.com/Mergifyio/mergify-pre-commit"
+Issues = "https://github.com/Mergifyio/mergify-pre-commit/issues"