Add Cosmos SDK (#2686)

readme.md

@@ -707,6 +707,7 @@
 - [Stacks](https://github.com/friedger/awesome-stacks-chain#readme) - A smart contract platform secured by Bitcoin.
 - [Algorand](https://github.com/aorumbayev/awesome-algorand#readme) - An open-source, proof of stake blockchain and smart contract computing platform.
 - [ZeroNet](https://github.com/zolagonano/awesome-zeronet#readme) - A decentralized web-like network of peer-to-peer users.
+- [Cosmos SDK](https://github.com/cosmos/awesome-cosmos#readme) - Modular framework for building app-specific blockchains in Go.
 
 ## Health and Social Science