Update README.md

Phala is a rust based confidentiality layer for Substrate and Polkadot based blockchains

README.md

@@ -169,6 +169,7 @@ See also [Rust — Production](https://www.rust-lang.org/production) organizatio
 * [Parity-Bridge](https://github.com/paritytech/parity-bridge) — Bridge between any two ethereum-based networks
 * [Parity-Ethereum](https://github.com/openethereum/openethereum) — Fast, light, and robust Ethereum client
 * [Parity-Zcash](https://github.com/paritytech/parity-zcash) — Rust implementation of the Zcash protocol
+* [Phala-Network/phala-blockchain](https://github.com/Phala-Network/phala-blockchain) — Confidential smart contract blockchain based on Intel SGX and Substrate
 * [Polkadot](https://github.com/paritytech/polkadot) — Heterogeneous multi‑chain technology with pooled security
 * [rbtc](https://github.com/lucawen/rbtc) — Convert BTC to any currency and vice-versa. [![Build Status](https://api.travis-ci.com/lucawen/rbtc.svg?branch=master)](https://travis-ci.com/lucawen/rbtc)
 * [rust-cardano](https://github.com/input-output-hk/rust-cardano) — Rust implementation of Cardano primitives, helpers, and related applications