Add request chain info to supported chains page

docs/96. supportedChains.mdx

@@ -9,6 +9,10 @@ import Table from "./supportedChainsTable.jsx";
 
 You can find the Sourcify chains, i.e. EVM chains that are supported by Sourcify, and the level of support below.
 
+:::info Adding a new chain
+If you want to add a new chain support to Sourcify check out [Requesting Chain Support](/docs/chain-support) page
+:::
+
 _If the tests for a chain will fail two weeks in a row, we will assume the chain is not being maintained and remove it from the supported chains list. The tests can be seen [in CircleCI](https://app.circleci.com/pipelines/github/ethereum/sourcify?branch=master) under "test-chains-regularly" workflow_
 
 <div>