modify plugin structure

Signed-off-by: Dmytro Stanchiev <git@dmytros.dev>

docs/README.opencode.md

@@ -0,0 +1,36 @@
+# Ralph Loop for OpenCode
+
+`opencode-plugin-ralph-loop` is an OpenCode plugin that registers Ralph Loop commands and manages continuation state for long-running iterative work.
+
+## Installation
+
+Add the plugin to `opencode.json`:
+
+```json
+{
+  "plugin": ["opencode-plugin-ralph-loop"]
+}
+```
+
+Restart OpenCode after installing.
+
+## Commands
+
+- `/ralph-loop`
+- `/ulw-loop`
+- `/cancel-ralph`
+
+## State
+
+Loop state is persisted to `.sisyphus/ralph-loop.local.md` in the current project directory.
+
+## Configuration
+
+Supported config files:
+
+- `~/.config/opencode/ralph-loop.json`
+- `~/.config/opencode/ralph-loop.jsonc`
+- `.opencode/ralph-loop.json`
+- `.opencode/ralph-loop.jsonc`
+
+Project config overrides user config.