Added README

Author: Dorthu

README.md

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+# Linode OpenAPI 3 Schema
+
+This is the API V4 OpenAPI 3 Schema
+
+## Development
+
+I recommend [Swagger Editor](https://github.com/swagger-api/swagger-editor) for
+development.  You can either download the application, or clone the linked repo
+and run `npm start` to launch it (or use the online version even).  Once in the
+editor, use the File menu to Import the swagger.yaml file in this directory and
+start editing!