added a page with data indexers, included PARSIQ data provider in it

arbitrum-docs/for-devs/third-party-docs/PARSIQ/parsiq.md

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+---
+title: "Quickstart: PARSIQ (blockchain data API & SDK)"
+description: "Learn how to use PARSIQ API and SDK to get Arbitrum data"
+author: Ivan-Ivanitskiy
+sme: Ivan-Ivanitskiy
+sidebar_label: "PARSIQ"
+---
+
+
+**[<ins>PARSIQ</ins>](https://www.parsiq.net/)** is a reliable, fully customizable blockchain data indexer, helping developers to seamlessly access, process and utilize Web3 data - both raw and custom.
+
+PARSIQ API allows querying blockchain data such as transactions, token transfers, events, internal function calls, blocks, etc.
+
+PARSIQ SDK allows accumulating, processing, and storing this data according to the developer-specified logic, as well as building your own API endpoints.
+
+Check out **[<ins>this introduction video</ins>](https://www.youtube.com/watch?v=kQJYJGt62hc)**
+to get started.
+
+## PARSIQ Tsunami API
+
+PARSIQ Tsunami API is a highly efficient API to fetch raw Web3 data:
+- Events, calls, transactions (internal included), transfers, contracts, blocks - you name it. Possibility to use unlimited blockrange makes Tsunami a hard-to-beat solution for realiably getting large amounts of data from the blockchain. CSV Export is available.
+- Get decoded, human readable data right out of the box.
+- Need an up to date feeds of data streamed to you in real time? Give our low latency Real Time Streaming service a try.
+
+:::info Endpoints
+
+Please check out our [<ins>PARSIQ API Reference</ins>](https://docs.parsiq.net/reference/introduction) to see all the available endpoints.
+
+:::
+
+## PARSIQ SDK
+
+Some more complicated cases where custom data needs to be stored, accumulated, and calculated, cannot be covered by an API. In that cases, use PARSIQ SDK or go for a Custom Data Lake. They allow you to set up data bases and data processing logic to solve your specific use case. 
+
+:::info SDK Documentation
+
+Please see [<ins>PARSIQ SDK documentation</ins>](https://docs.parsiq.net/reference/your-own-web3-api) for more details.
+
+:::
+