Create README.md

Author: leonid-shevtsov

fetch-task-definition/README.md

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+# fetch-task-definition
+
+Fetch task definition from ECS (to use with [aws-actions/amazon-ecs-render-task-definition](https://github.com/aws-actions/amazon-ecs-render-task-definition)).
+
+Make sure to provide AWS credentials through the environment: `AWS_ACCESS_KEY_ID`, `AWS_SECRET_ACCESS_KEY`, `AWS_REGION`
+
+```yml
+- uses: railsware/github-actions/fetch-task-definition@master
+  with:
+    name: my_task_definition_name
+    # Default filename is task_definition.json
+    filename: my_task_definition.json
+```
+
+