Add solana whitepaper (#3781)

* Solana whitepaper added

* Update src/data/roadmaps/blockchain/content/101-blockchain-general-knowledge/109-blockchains/100-solana.md

---------

Co-authored-by: Kamran Ahmed <kamranahmed.se@gmail.com>

src/data/roadmaps/blockchain/content/101-blockchain-general-knowledge/109-blockchains/100-solana.md

@@ -7,5 +7,6 @@ Visit the following resources to learn more:
 - [What is Solana, and how does it work?](https://cointelegraph.com/news/what-is-solana-and-how-does-it-work)
 - [Beginners Guide To Solana](https://solana.com/news/getting-started-with-solana-development)
 - [Solana Introduction](https://docs.solana.com/introduction)
+- [Solana Whitepaper](https://solana.com/solana-whitepaper.pdf)
 - [Solana Architecture](https://docs.solana.com/cluster/overview)
 - [Start Building Solana!](https://beta.solpg.io/?utm_source=solana.com)