Add README

Author: mfisher87

README.md

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+# AlexJS pre-commit mirror
+
+Mirror of [AlexJS](https://alexjs.com) for [pre-commit](https://pre-commit.com).
+
+## Using AlexJS with `pre-commit`
+
+Example `.pre-commit.config.yml`:
+
+```yaml
+repos:
+  - repo: "https://github.com/mfisher87/alexjs-pre-commit-mirror"
+    rev: "v11.0.1"  # Use the sha / tag you prefer
+    hooks:
+    - id: "alex"
+```
+
+## Continuous Integration
+
+Two example ways to run AlexJS inclusive language checks in CI for your repository using
+your existing `pre-commit` configuration from the previous step:
+
+* [The official pre-commit GitHub action](https://github.com/pre-commit/action): :rock:
+  Very stable
+* [pre-commit.ci](https://pre-commit.ci): :zap: Faster, but has more frequent outages.