Update README overview section

Signed-off-by: Alexander Shenshin <[email protected]>

Author: AlexanderShenshin

README.md

@@ -12,25 +12,29 @@ This library is using [Hiero Python SDK](https://github.com/hiero-ledger/hiero-s
 
 # Table of contents
 
-1. [Documentation](#documentation)
-2. [Getting started](#getting-started)
-3. [Configuration](#configuration)
-4. [Contributing](CONTRIBUTING.md)
-   
+1. [Overview](#overview)
+2. [Documentation](#documentation)
+3. [Getting started](#getting-started)
+4. [Configuration](#configuration)
+5. [Contributing](CONTRIBUTING.md)
+
 ## Overview
 
-Identity networks are set of artifacts on Hedera Consensus Service that allow applications to share common channels to publish and resolve DID documents, issue verifiable credentials and control their validity status. These artifacts include:
-* address book - a file on Hedera File Service that provides information about HCS topics and appnet servers,
-* DID topic - an HCS topic intended for publishing DID documents,
-* and VC topic - an HCS topic playing a role of verifiable credentials registry.
-   
-This SDK is designed to simplify :
-* creation of identity networks within appnets, that is: creation and initialization of the artifacts mentioned above,
-* generation of decentralized identifiers for Hedera DID Method and creation of their basic DID documents,
-* creation (publishing), update, deletion and resolution of DID documents in appnet identity networks,
-* issuance, revocation and status verification of Verifiable Credentials.
-   
-The SDK does not impose any particular way of how the DID or verifiable credential documents are constructed.
+Decentralized identity ecosystems are built upon decentralized identifiers (DIDs) and verifiable credentials (VCs) standards, providing necessary functionality to publish and resolve DID documents and issue/verify credentials (claims).
+
+Data model of such ecosystems rely on [Verifiable Data Registries (VDRs)](https://w3c.github.io/vc-data-model/#dfn-verifiable-data-registries), commonly represented by decentralized ledgers.
+
+[Hiero](https://hiero.org/), as an open-source Decentralized Ledger Technology (DLT), is a great VDR option providing high-performance and low costs of operations.
+Hedera, while being built on Hiero, is a large and trusted network that will be a great choice for solutions searching for high-reliability.
+
+In particular, Hedera and other Hiero-based networks can be used as VDR for [Hedera DID Method](https://github.com/hashgraph/did-method/blob/master/hedera-did-method-specification.md) and [AnonCreds Verifiable Credentials](https://github.com/hyperledger/anoncreds-spec) by leveraging Hedera Consensus Service (HCS).
+
+This SDK is designed to simplify:
+
+- Creation and management of Hedera DID documents
+- Creation and management of AnonCreds resources
+- Adoption of Hiero-based VDRs for AnonCreds use cases
+- Empowering new and existing Python-based agent implementations with high-performance and low operational costs provided by Hiero
 
 ## Documentation