Add skill definition

opencode_skill.md

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+---
+name: knowledge-rag-usage
+description: Use the knowledge-rag MCP server for building/using a growing knowledge base
+---
+
+## What I do
+
+Provide guidelines on the use and building of the knowledge base.
+
+## When to use me
+
+- When you need to see if there is available knowledge to help complete the task
+  - Use the `search_knowledge` tool to get this knowledge
+- When you need to add what you have learned to the knowledge base
+  - Add the knowledge in the form of a markdown file to `~/knowledge-base/knowledge` directory
+  - Index the knowledge with the `index_knowledge` with the `force=false` parameter so that it is available for searching
+
+## Guidelines
+
+- Upon the start of any task, you must check the knowledge base to see if there is existing information on the subject
+- Upon completion of any task, you must add any useful knowledge learned to the knowledge base
+- Any time you are corrected, you must add the correction to the knowledge base so that no mistake happens twice
+- When adding new knowledge to the knowledge base, try to keep related knowledge to the same files
+  - Create new files only when no existing file contains information on that topic
+- New knowledge must be brief. Use as little words possible to express the knowledge