docs: add index.md for bindings folder (#3180)

Co-authored-by: Lukasz Gornicki <lpgornicki@gmail.com>

assets/docs/fragments/bindings-overview.md

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+Bindings in AsyncAPI provide a way to add protocol-specific information to the AsyncAPI documentation. They can be added to different document parts, such as servers, channels, or messages; they specify standard details specific to a particular protocol. The purpose of bindings is to enhance the API's understanding and usage by providing additional context and configuration options for different protocols.

markdown/docs/concepts/asyncapi-document/adding-bindings.md

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 weight: 260
 ---
 
-Bindings in AsyncAPI provide a way to add protocol-specific information to the AsyncAPI documentation. They can be added to different document parts, such as servers, channels, or messages; they specify standard details specific to a particular protocol. The purpose of bindings is to enhance the API's understanding and usage by providing additional context and configuration options for different protocols.
+import BindingsOverview from '../../../../assets/docs/fragments/bindings-overview.md' 
+
+<BindingsOverview/>
 
 The following diagram highlights the sections where bindings can be implemented:
 

markdown/docs/reference/bindings/_section.md

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+---
+title: Bindings
+weight: 15
+---

markdown/docs/reference/bindings/index.md

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+---
+title: Overview
+weight: 15
+---
+
+## Overview
+
+import BindingsOverview from '../../../../assets/docs/fragments/bindings-overview.md' 
+
+<BindingsOverview/>
+
+## Usage in an AsyncAPI document
+
+To learn how to add bindings to your AsyncAPI document, read [Adding bindings](/docs/concepts/asyncapi-document/adding-bindings) concept document, or read the guide about using [Kafka bindings](/docs/tutorials/kafka/bindings-with-kafka).
+
+## Contributing to bindings
+
+Bindings are maintained by different community members that know and use given protocol and technology in production. If something can be improved, or some new binding is needed, open an issue in [bindings repository](https://github.com/asyncapi/bindings).