Supported chains docs for Unity

docs/appkit/unity/core/options.mdx

@@ -31,6 +31,36 @@ await AppKit.InitializeAsync(new AppKitConfig
 });
 ```
 
+### Supported Chains
+
+Allows to set supported chains for the application. Can use predefined chain constants from `ChainConstants.Chains` or custom `Chain` objects.
+
+```csharp
+await AppKit.InitializeAsync(new AppKitConfig
+{
+    supportedChains = new[]
+    {
+        ChainConstants.Chains.Ethereum,
+        ChainConstants.Chains.Polygon,
+        ChainConstants.Chains.Ronin,
+
+        new Chain(ChainConstants.Namespaces.Evm,
+            chainReference: "713715",
+            name: "Sei Devnet",
+            nativeCurrency: new Currency("Sei", "SEI", 18),
+            blockExplorer: new BlockExplorer("Seitrace", "https://seitrace.com"),
+            rpcUrl: "https://evm-rpc-arctic-1.sei-apis.com",
+            isTestnet: true,
+            imageUrl: $"https://api.web3modal.com/public/getAssetImage/692ed6ba-e569-459a-556a-776476829e00",
+            viemName: "seiDevnet" // required only on WebGL
+        )
+    }
+});
+```
+The `viemName` argument of the `Chain` constructor is required only when targeting WebGL.
+The full list of chain names can be found in [the Viem source code](https://github.com/wevm/viem/blob/main/src/chains/index.ts).
+
+
 ### Enable Installed Wallet Detection
 
 To enable AppKit to detect wallets installed on mobile devices, you need to make specific changes to the native side of the project.