add to main readme

README.md

@@ -6,11 +6,12 @@ Fleet (Fluent Ergo Toolset) is a pure JavaScript SDK for Ergo Platform. Fleet pr
 
 This is a [monorepository](https://monorepo.tools/) which means this contains many sub-packages that composes full Fleet SDK implementation.
 
-| Package                               | Description                                                                          |                                                                                                       |
-| ------------------------------------- | ------------------------------------------------------------------------------------ | :---------------------------------------------------------------------------------------------------: |
-| [@fleet-sdk/core](/packages/core/)    | Core library with transaction builder and basic serialization.                       |   [![npm](https://badgen.net/npm/v/@fleet-sdk/core)](https://www.npmjs.com/package/@fleet-sdk/core)   |
-| [@fleet-sdk/wallet](/packages/wallet) | Wallet related library, with mnemonic and keys creation and derivation.              | [![npm](https://badgen.net/npm/v/@fleet-sdk/wallet)](https://www.npmjs.com/package/@fleet-sdk/wallet) |
-| [@fleet-sdk/common](/packages/common) | Internal utility functions, constants and types shared across `@fleet-sdk` packages. | [![npm](https://badgen.net/npm/v/@fleet-sdk/common)](https://www.npmjs.com/package/@fleet-sdk/common) |
+| Package                                       | Description                                                                          |                                                                                                               |
+| --------------------------------------------- | ------------------------------------------------------------------------------------ | :-----------------------------------------------------------------------------------------------------------: |
+| [@fleet-sdk/core](/packages/core/)            | Core library with transaction builder and basic serialization.                       |       [![npm](https://badgen.net/npm/v/@fleet-sdk/core)](https://www.npmjs.com/package/@fleet-sdk/core)       |
+| [@fleet-sdk/wallet](/packages/wallet)         | Wallet related library, with mnemonic and keys creation and derivation.              |     [![npm](https://badgen.net/npm/v/@fleet-sdk/wallet)](https://www.npmjs.com/package/@fleet-sdk/wallet)     |
+| [@fleet-sdk/common](/packages/common)         | Internal utility functions, constants and types shared across `@fleet-sdk` packages. |     [![npm](https://badgen.net/npm/v/@fleet-sdk/common)](https://www.npmjs.com/package/@fleet-sdk/common)     |
+| [@fleet-sdk/mock-chain](/packages/mock-chain) | Mock chain and testing utilities for Ergo Smart Contracts.                           | [![npm](https://badgen.net/npm/v/@fleet-sdk/mock-chain)](https://www.npmjs.com/package/@fleet-sdk/mock-chain) |
 
 ## Plugins