Add Unity support for Solana network (#771)

Author: skibitsky

appkit/networks/solana.mdx

@@ -39,4 +39,8 @@ The AppKit SDK supports Solana and SVM-based chains, allowing users to connect t
   <Card title="React Native" icon="react" href="/appkit/react-native/core/installation#solana">
     Get started with AppKit in React Native.
   </Card>
+
+  <Card title="Unity" icon="unity" href="/appkit/unity/core/installation">
+    Get started with AppKit in Unity.
+  </Card>
 </CardGroup>

appkit/networks/supported-chains.mdx

@@ -14,7 +14,7 @@ Looking for the full list of chains supported by the WalletConnect protocol? See
 | Chain | Platforms |
 |---|---|
 | **EVM** (Ethereum, Polygon, Arbitrum, Optimism, Base, etc.) | React, Next.js, Vue, JavaScript, Svelte, Nuxt, React Native, Flutter, Android, iOS, Unity |
-| **Solana** | React, Next.js, Vue, JavaScript, React Native |
+| **Solana** | React, Next.js, Vue, JavaScript, React Native, Unity |
 | **Bitcoin** | React, Next.js, Vue, JavaScript, React Native |
 | **TON** | React, Next.js, Vue, JavaScript, Svelte, Nuxt |
 | **TRON** | React, Vue, JavaScript |
@@ -30,7 +30,7 @@ AppKit supports all EVM-compatible chains. As long as the chain is included in [
 
 ### Solana
 
-AppKit supports Solana on web frameworks and React Native. You can connect Solana wallets and interact with the Solana network directly through the SDK.
+AppKit supports Solana on web frameworks, React Native, and Unity. You can connect Solana wallets and interact with the Solana network directly through the SDK.
 
 <Card title="Solana Setup Guide" icon="circle-nodes" href="/appkit/networks/solana" horizontal>
   Get started with Solana in AppKit.