Add Stacks (#2039)

readme.md

@@ -672,6 +672,7 @@
 - [Waves](https://github.com/msmolyakov/awesome-waves#readme) - Open source blockchain platform and development toolset for Web 3.0 apps and decentralized solutions.
 - [Substrate](https://github.com/substrate-developer-hub/awesome-substrate#readme) - Framework for writing scalable, upgradeable blockchains in Rust.
 - [Golem](https://github.com/golemfactory/awesome-golem#readme) - Open source peer-to-peer marketplace for computing resources.
+- [Stacks](https://github.com/friedger/awesome-stacks-chain#readme) - A smart contract platform secured by Bitcoin.
 
 ## Higher Education