opencode: add page

pages/common/opencode.md

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+# opencode
+
+> AI coding agent.
+> More information: <https://opencode.ai/docs/cli/>.
+
+- Start the interactive terminal UI:
+
+`opencode`
+
+- List all available models from configured providers:
+
+`opencode models`
+
+- Run opencode in a non-interactive mode by passing a prompt directly:
+
+`opencode run {{message}}`
+
+- Manage AI assistant agents for OpenCode:
+
+`opencode agent {{command}}`
+
+- Create a new agent with custom configuration:
+
+`opencode agent create`