adds envio as supported data indexer

docs/ecosystem/data-indexers/envio.md

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+---
+title: Envio
+sidebar_position: 3
+---
+
+Envio is a modern, multi-chain EVM blockchain indexing framework speed-optimized for querying real-time and historical data.
+
+### Understanding Envio
+
+#### Envio HyperIndex
+
+Envio [HyperIndex](https://docs.envio.dev/docs/overview) is a feature-rich indexing solution that provides Kakarot Starknet projects with a seamless and efficient way to index and aggregate real-time or historical blockchain data. The indexed data is easily accessible through custom GraphQL queries, giving developers the flexibility and power to retrieve specific information for their blockchain application.
+
+Envio offers native support for Kakarot Starknet networks and has been designed to support high-throughput blockchain applications that rely on real-time data for their business requirements.
+
+Designed to optimize the developer experience, Envio offers automatic code generation, flexible language support, quickstart templates, and a reliable cost-effective [hosted service](https://docs.envio.dev/docs/hosted-service). Indexers on Envio can be written in JavaScript, TypeScript, or ReScript.
+
+#### Envio HyperSync
+
+Envio [HyperSync](https://docs.envio.dev/docs/overview-hypersync) is adding support on Kakarot Starknet Sepolia and to-be Kakarot Starknet mainnet. 
+
+HyperSync is a real-time data query layer for Kakarot Starknet, providing APIs that bypass traditional JSON-RPC for up to 1000x faster syncing of historical data. HyperSync is used by default in Envio's indexing framework (HyperIndex), with RPC being optional for data retrieval. 
+
+Using HyperSync, Kakarot Starknet projects do not need to worry about RPC URLs, rate-limiting, or managing their infrastructure - and can easily sync large datasets in a few minutes, something that would usually take hours or days using traditional indexing solutions. 
+
+HyperSync is also available as a standalone API for data analytic use cases. Data analysts can interact with the HyperSync API using JavaScript, Python, or Rust clients and extract data in JSON, Arrow, or Parquet formats.
+
+## Getting Started
+
+Developers can choose to start from a template (e.g. Blank, ERC-20, etc.), or use the Contract Import feature when running the `envio init` command. Make sure you have installed the Envio CLI following the [installation guide](https://docs.envio.dev/docs/getting-started). 
+
+The [Contract Import](https://docs.envio.dev/docs/contract-import) feature is a quickstart that allows Kakarot ZK-EVM developers to quickly autogenerate the key boilerplate for an entire indexer project off single or multiple smart contracts, and easily create a basic indexer and a custom API for their blockchain application within a few minutes.
+
+**Envio Indexer Examples**
+
+Click [here](https://docs.envio.dev/docs/example-uniswap-v3) for Indexer examples.
+
+**Getting support**
+
+Indexing can be a rollercoaster, especially for more complex use cases. The Envio engineers are available to help you with your data availability needs.
+
+* [Discord](https://discord.gg/mZHNWgNCAc)
+* Email: [[email protected]](mailto:[email protected])
+