Add Pyth readme

Author: valentinmadrid

oracles/pyth/README.md

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+## What is Pyth ?
+
+Pyth is an Oracle that offers on-chain low-latency market data from institutional sources.
+This means you can use prices from real-life assets in your Solana programs.
+
+The price for each asset will be represented inside of a Solana account. We call those accounts price feeds.
+
+For example, the price feed for SOL/USD on mainnet is represented on this account address: `H6ARHf6YXhGYeQfUzQNGk6rDNnLBQKrenN712K4AQJEG`.
+
+You can find more of these price feeds [here](https://pyth.network/price-feeds?cluster=mainnet-beta).
+
+To use such a price feed, you need to pass its account into your instructions context. 
+
+You can get an asset's information by reading the account's data. The feed will consist of:
+
+- A price
+- A confidence interval
+- An exponent
+
+To read more about Pyth, please navigate to [the Pyth documentation](https://docs.pyth.network/solana-price-feeds).
+
+