docs: add opencode installation instructions (#895)

README.md

@@ -100,6 +100,29 @@ Go to `Advanced settings` -> `Extensions` -> `Add custom extension`. Name to you
 Go to `Program` in the right sidebar -> `Install` -> `Edit mcp.json`. Use the standard config above.
 </details>
 
+<details>
+<summary>opencode</summary>
+
+Follow the MCP Servers [documentation](https://opencode.ai/docs/mcp-servers/). For example in `~/.config/opencode/opencode.json`:
+
+```json
+{
+  "$schema": "https://opencode.ai/config.json",
+  "mcp": {
+    "playwright": {
+      "type": "local",
+      "command": [
+        "npx",
+        "@playwright/mcp@latest"
+      ],
+      "enabled": true
+    }
+  }
+}
+
+```
+</details>
+
 <details>
 <summary>Qodo Gen</summary>