feat(plugin): Create skeleton

plugin/service/storage/README.md

@@ -0,0 +1,35 @@
+## Getting Started
+
+To create a storage bucket (using default scope created by `boundary dev`):
+
+```bash
+boundary storage-buckets create \
+  -scope-id p_1234567890 \
+  -name "Example Plugin-Based Storage Bucket" \
+  -description "Description for plugin-based storage bucket" \
+  -plugin-name minio \
+  -bucket-name="session_recording_storage" \
+  -bucket-prefix="foo/bar/zoo" \
+  -worker-filter '"minio-access" in "/tags/type"' \
+  -attr endpoint_url="https://my-minio-instance.dev/s3-api" \
+  -attr region=REGION \
+  -secret access_key_id='KEY' \
+  -secret secret_access_key='SECRET'
+```
+
+### Attributes
+
+The following `attributes` are valid on a MinIO storage bucket resource:
+
+- `endpoint_url` (string, required): Fully-qualified endpoint pointing to a
+  MinIO S3 API.
+- `region` (string, optional): The region to configure the storage bucket for.
+
+### Secrets
+
+The following `secrets` are valid on a MinIO storage bucket resource:
+
+- `access_key_id` (string, required): The MinIO service account's access key to
+  use with this storage bucket.
+- `secret_access_key` (string, required): The MinIO service account's secret key
+  to use with this storage bucket.