add readme files

Author: jonhealy1

stac_fastapi/core/README.md

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+# stac-fastapi-core
+
+Core functionality for stac-fastapi. For full documentation, please see the [main README](https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch/blob/main/README.md).
+
+## Package Information
+
+- **Package name**: stac-fastapi-core
+- **Description**: Core functionality for STAC API implementations.
+- **Documentation**: [https://stac-utils.github.io/stac-fastapi-elasticsearch-opensearch/](https://stac-utils.github.io/stac-fastapi-elasticsearch-opensearch/)
+- **Source**: [GitHub Repository](https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch/)
+
+## Installation
+
+```bash
+pip install stac-fastapi-core
+```
+
+## Quick Start
+
+For detailed usage and examples, please refer to the [main documentation](https://stac-utils.github.io/stac-fastapi-elasticsearch-opensearch/).

stac_fastapi/elasticsearch/README.md

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+# stac-fastapi-elasticsearch
+
+This is the Elasticsearch backend for stac-fastapi. For full documentation, please see the [main README](https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch/blob/main/README.md).
+
+## Package Information
+
+- **Package name**: stac-fastapi-elasticsearch
+- **Description**: An implementation of STAC API based on the FastAPI framework with Elasticsearch.
+- **Documentation**: [https://stac-utils.github.io/stac-fastapi-elasticsearch-opensearch/](https://stac-utils.github.io/stac-fastapi-elasticsearch-opensearch/)
+- **Source**: [GitHub Repository](https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch/)
+
+## Installation
+
+```bash
+pip install stac-fastapi-elasticsearch
+```
+
+## Quick Start
+
+For detailed usage and examples, please refer to the [main documentation](https://stac-utils.github.io/stac-fastapi-elasticsearch-opensearch/).

stac_fastapi/opensearch/README.md

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+# stac-fastapi-opensearch
+
+This is the OpenSearch backend for stac-fastapi. For full documentation, please see the [main README](https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch/blob/main/README.md).
+
+## Package Information
+
+- **Package name**: stac-fastapi-opensearch
+- **Description**: An implementation of STAC API based on the FastAPI framework with OpenSearch.
+- **Documentation**: [https://stac-utils.github.io/stac-fastapi-elasticsearch-opensearch/](https://stac-utils.github.io/stac-fastapi-elasticsearch-opensearch/)
+- **Source**: [GitHub Repository](https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch/)
+
+## Installation
+
+```bash
+pip install stac-fastapi-opensearch
+```
+
+## Quick Start
+
+For detailed usage and examples, please refer to the [main documentation](https://stac-utils.github.io/stac-fastapi-elasticsearch-opensearch/).

stac_fastapi/sfeos_helpers/README.md

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+# sfeos-helpers
+
+Helper utilities for the stac-fastapi project. For full documentation, please see the [main README](https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch/blob/main/README.md).
+
+## Package Information
+
+- **Package name**: sfeos-helpers
+- **Description**: Helper utilities for the stac-fastapi project.
+- **Documentation**: [https://stac-utils.github.io/stac-fastapi-elasticsearch-opensearch/](https://stac-utils.github.io/stac-fastapi-elasticsearch-opensearch/)
+- **Source**: [GitHub Repository](https://github.com/stac-utils/stac-fastapi-elasticsearch-opensearch/)
+
+## Installation
+
+This package is a dependency of stac-fastapi-elasticsearch and stac-fastapi-opensearch and is typically installed automatically.
+
+```bash
+pip install stac-fastapi-elasticsearch  # or stac-fastapi-opensearch
+```
+
+## Quick Start
+
+For detailed usage and examples, please refer to the [main documentation](https://stac-utils.github.io/stac-fastapi-elasticsearch-opensearch/).