Add readme

Author: ChappIO

README.md

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+# Directus CLI Extension: Schema Sync
+
+This extension adds the cli command `schema-sync` to the directus except it uses a modified .yml format which should cause fewer merge conflicts during git merges.
+
+**Note:** This extension is very much under development.
+Even though I've tested it, I haven't had it in production for a long time.
+And it is touching your database 🤷🏻‍♂️.
+
+## Usage:
+
+1. Install the extension: `npm install directus-extension-schema-sync`.
+2. Export your schema: `directus schema-sync snapshot --output schema.yml`:
+3. Import your schema `directus schema-sync apply schema.yml`