Update README.md

Additional guidance on the usage of the SDK.

README.md

@@ -1,4 +1,16 @@
-# `Dock` SDK monorepository
+# `Dock` SDK
+
+## Overview
+
+The Dock SDK is an opensource library that powers Dock's SaaS API. It provides the credential management, cryptography, and blockchain storage features for Dock's supported credential variants:
+
+* W3C VC JSON-LD ed25519 credential using StatusList 2021 for revocation targetted at interoperability
+* W3C VC JSON-LD BBS credential using accumulators for revocation targetted at privacy
+* W3C VC JSON-LD KVAC credential using accumulators for revocation allowing monetization of credentials
+
+Most of the SDK is written in JavaScript / TypeScript with safety-critical code written in Rust. The SDK depends on [the Arkworks math library](https://github.com/arkworks-rs/algebra).
+
+## Monorepository Packages
 
 Features five packages, such as
 
@@ -16,4 +28,9 @@ In essence, the architecture is structured as follows:
 - Specific implementations for the `Dock` and `Cheqd` blockchain modules can be found in `@docknetwork/dock-blockchain-modules`* and `@docknetwork/cheqd-blockchain-modules`, respectively.
 - Basic blockchain connectors for the `Dock` and `Cheqd` blockchain are available through `@docknetwork/dock-blockchain-api`* and `@docknetwork/cheqd-blockchain-api`.
 
+## Deprecated Features
+
 * Dock blockchain will be sunset in 2025. [More information.](https://www.dock.io/post/dock-and-cheqd-form-alliance-to-accelerate-global-adoption-of-decentralized-id#stronglong-termstrong)
+
+Some features of the SDK are deprecated and will be removed in a future release:
+* StatusList2017