Add README with Claude Code facts collection

Initial README covering Context7 MCP server and AST Index skill.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

README.md

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+# Claude Code Facts
+
+A collection of interesting and useful facts, tips, and tools for working with Claude and Claude Code — including plugins, MCP servers, and practical usage patterns.
+
+## MCP Servers
+
+### Context7
+
+Up-to-date documentation and code examples for any library, available directly in your Claude Code session.
+
+- **Website:** https://context7.com/
+- **Setup:**
+  ```bash
+  claude mcp add --scope user --transport http context7 https://mcp.context7.com/mcp --header "CONTEXT7_API_KEY: <YOUR_API_KEY>"
+  ```
+
+- **Note:** API key can be created for free after signing in at [context7.com](https://context7.com/)
+
+### AST Index
+
+Fast code search skill for Claude Code — find classes, symbols, usages, implementations, and more across large codebases.
+
+- **Repository:** https://github.com/defendend/Claude-ast-index-search