modify plugin structure

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

README.md

@@ -2,6 +2,16 @@
 
 Standalone implementation of the **Ralph Loop** (self-referential dev loop) extracted from `oh-my-opencode`.
 
+## OpenCode Install
+
+Tell OpenCode:
+
+```text
+Fetch and follow instructions from ./.opencode/INSTALL.md
+```
+
+Detailed OpenCode docs: `docs/README.opencode.md`
+
 Provides:
 - `/ralph-loop` command
 - `/ulw-loop` command (ultrawork mode)