Create README.md for AUTO plugin (#14861)

* Create README.md for AUTO plugin

* link to contribuation guidance

* Update README.md according to developer documentation guidance

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src/plugins/auto/README.md

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+# OpenVINO™ AUTO Plugin
+
+The main responsibility of the AUTO plugin is to provide a unified device that enables developers to code deep learning applications once and deploy them anywhere. 
+
+Other capabilities of the AUTO plugin include:
+* Static device selection, which intelligently loads a network to one device or multiple devices.
+* CPU acceleration to start inferencing while the target device is still loading the network.
+* Model priority support for loading multiple networks to multiple devices.
+
+The component is written in `C++`. If you want to contribute to the AUTO plugin, follow [the common coding style rules](../../../docs/dev/coding_style.md).
+
+## Key contacts
+
+In case of any questions, review and merge requests, contact the [AUTO Plugin maintainer group](https://github.com/orgs/openvinotoolkit/teams/openvino-ie-auto-multi-maintainers).
+
+## Components
+
+The AUTO plugin follows the OpenVINO™ plugin architecture and consists of several main components:
+ * [docs](./docs) contains developer documentation for the AUTO plugin.
+ * [current](./) folder contains sources of the AUTO plugin.
+
+Learn more in the [OpenVINO™ Plugin Developer Guide](https://docs.openvino.ai/latest/openvino_docs_ie_plugin_dg_overview.html).
+
+## Architecture
+The diagram below shows an overview of the components responsible for the basic inference flow:
+
+```mermaid
+flowchart TD
+
+    subgraph Application["Application"]
+    end
+
+    subgraph OpenVINO Runtime["OpenVINO Runtime"]
+        AUTO["AUTO Plugin"] --> CPU["CPU Plugin"]
+        AUTO["AUTO Plugin"] --> GPU["GPU Plugin"]
+    end
+
+    Application --> AUTO
+
+    style Application fill:#6c9f7f
+```
+Find more details in the [AUTO Plugin architecture](./docs/architecture.md) document.
+
+## Tutorials
+* [Testing the AUTO Plugin](./docs/tests.md)
+* [Integrating a new hardware plugin with the AUTO plugin](./docs/integration.md)
+
+## See also
+ * [OpenVINO™ README](../../../README.md)
+ * [OpenVINO Core Components](../../README.md)
+ * [Developer documentation](../../../docs/dev/index.md)

src/plugins/auto/docs/architecture.md

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+# AUTO Plugin Architecture
+
+TBD-100527
+
+## See also
+ * [AUTO Plugin README](../README.md)
+ * [OpenVINO™ README](../../../../README.md)
+ * [Developer documentation](../../../../docs/dev/index.md)

src/plugins/auto/docs/integration.md

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+# AUTO Plugin Integration
+
+## How to integrate a new hardware plugin 
+
+TBD-100527

src/plugins/auto/docs/tests.md

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+# AUTO Plugin tests
+
+## AUTO plugin testing places
+
+TBD-100527
+
+## How to run tests
+
+TBD-100527