Feat(pricefeed/price feed id) add data

pages/price-feeds/_meta.json

@@ -36,8 +36,9 @@
   },
 
   "api-reference": "API Reference",
-  "price-feed-ids": "Price Feed IDs",
+  "price-feeds": "Price Feeds",
   "sponsored-feeds": "Sponsored Feeds",
+  "asset-classes": "Asset Classes",
   "market-hours": "Market Hours",
   "best-practices": "Best Practices",
   "error-codes": "Error Codes",

pages/price-feeds/price-feeds.mdx

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+# Price Feeds
+
+Pyth Price Feeds provide real-time, first-party, market data for a wide range of assets.
+
+Every price feed has a **unique ID**, representing the specific pair of assets being priced.
+These specific pairs are part of an asset class, which is a broader category of assets.
+
+Anyone can fetch available price feeds and their IDs via [Hermes API](https://hermes.pyth.network/docs/#/rest/price_feeds_metadata).
+
+## Asset Classes
+
+Every price feed belongs to an asset class. These asset classes distinguish between different types of assets, such as crypto, US equities, and metals.
+
+Refer to the [Asset Classes](./price-feeds/asset-classes.md) page to learn more about the existing asset classes.
+
+## Price Feed IDs
+
+Price Feed IDs are unique identifiers for each specific pair of assets being priced (e.g. BTC/USD).
+Every price update is tagged with the corresponding price feed ID.
+
+Applications need to store the IDs of the feeds they wish to read.
+However, the IDs may be represented in different formats (e.g. hex or base58) depending on the blockchain.
+Price feeds also have different IDs in the Stable and Beta channels.
+
+Refer to the [Price Feed ID reference catalog](https://www.pyth.network/developers/price-feed-ids) to identify a feed's ID in your chosen ecosystem.
+
+### Solana Price Feed Accounts
+
+On Solana, each feed additionally has a collection of **price feed accounts** containing the feed's data.
+The addresses of these accounts are programmatically derived from the feed id and a shard id, which is simply a 16-bit number.
+See [How to Use Real-Time Data on Solana](./use-real-time-data/solana#price-feed-accounts) for more information on price feed accounts.

pages/price-feeds/price-feeds/_meta.json

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+{
+  "asset-classes": "Asset Classes"
+}

pages/price-feeds/price-feeds/asset-classes.mdx

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+# Asset Classes
+
+[Pyth price feeds](https://www.pyth.network/price-feeds) provide market data for the following asset classes:
+
+| Asset Class | Subclass         | Definition                                                                                                                                                                                                                       |
+| ----------- | ---------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| Crypto      | Spot Prices      | Real-time prices for cryptocurrencies and digital assets                                                                                                                                                                         |
+|             | Redemption Rates | Real-time swap rates derived from smart contracts for the redemption of liquid staking and liquid restaking tokens (LSTs and LRTs), liquidity provider tokens (LP Tokens) and interest-bearing assets, including tokenised notes |
+|             | Indices          | Real-time prices that measure the performance of baskets of cryptocurrencies and digital assets                                                                                                                                  |
+| US Equities | Spot Prices      | Real-time prices for US equities                                                                                                                                                                                                 |
+| FX          | Spot Prices      | Real-time prices for fiat currency pairs                                                                                                                                                                                         |
+| Metals      | Spot Prices      | Real-time prices for precious metals                                                                                                                                                                                             |
+| Rates       | Future Prices    | Real-time prices for fixed income products, including bond futures                                                                                                                                                               |
+| Commodities | Futures Prices   | Real-time prices for commodity futures                                                                                                                                                                                           |