feat: add readme

Author: ali-bahjati

README.md

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+# Pythnet
+
+Pythnet is an application-specific blockchain operated by Pyth's data providers. This blockchain is a computation
+substrate to securely combine the data provider's prices into a single aggregate price for each Pyth price feed. Pythnet
+forms the core of Pyth's off-chain price feeds that serve all blockchains.
+
+Pythnet is powered by Solana technology: it is based on the same validator software, but is a Pyth specific chain that
+is independent of Solana's mainnet. The Pyth Data Association enables each data provider to operate one validator by
+delegating them the necessary stake. Once governance is live, it will take over management of validators from the Pyth
+Data Association.
+
+# Development
+
+The Pythnet codebase is a fork of Solana's mainnet codebase. The most recent version of the codebase can be found at
+branch `pyth-v1.14.17` which includes Pythnet specific changes on top of Solana's mainnet codebase at v1.14.17
+(versioned with one more digit at `1.14.17X`).